This nuclear chemistry video tutorial explains how to solve carbon-14 dating problems. It discusses how to estimate the age of an expired piece of wood based on the radioactive decay of the C-14 isotope which undergoes beta decay. It discusses how to use two formulas given the carbon-14 decay rate in counts per minute per gram to estimate the age of the sample. This video contains plenty of examples and practice problems. New Chemistry Video Playlist: https://www.youtube.com/watch?v=bka20Q9TN6M&t=25s&list=PL0o_zxa4K1BWziAvOKdqsMFSB_MyyLAqS&index=1 Access to Premium Videos: https://www.patreon.com/MathScienceTutor Facebook: https://www.facebook.com/MathScienceTutoring/
Просмотров: 8067 The Organic Chemistry Tutor
Uranium is a unique element, used in research, medicine, space travel, and of course weapons. Not broadcast in your country? Contact your local broadcaster and/or email www.genepoolproductions.com Documentary Dates: US: PBS, July 28 & 29 @ 10pm ET / 9pm Central France & Germany: ZDF/arte July 31 @ 10pm Australia: SBS, August 6, 13, 20 @ 8:30pm EST If you're wondering where the title comes from... “A number of ingenious experiments were devised to test the speed of the fission reaction, and the limit was pushed. But even so, I thought it would be very nice to go one step nearer to a real atomic explosion. Dick Feynman, who was present, started to chuckle and to say that this is just like tickling the tail of a sleeping dragon.” Professor Otto R Frisch, January 1969 Physicist, the Manhattan Project.
Просмотров: 1284945 Veritasium
Today we are here with an animated video explaining why radiometric dating is not reliable. Unfortunately for them, Professor Stick shall respond. Support me on Patreon: https://www.patreon.com/user?u=3308388 Follow me on Twitter: https://twitter.com/StickProfessor Original Video: https://www.youtube.com/watch?v=bmjzE9wHBUU ♫ Lose Heart by Frame Away https://www.youtube.com/watch?v=UJan-CGIiJE FAIR USE NOTICE: This video may contain copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available in our efforts to advance understanding of environmental, political, human rights, economic, democracy, scientific, and social justice issues, etc. We believe this constitutes a 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes.
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How do you recover gold that’s been dissolved in acid? How do we know the half-life of uranium? We take on your burning chemistry questions. Subscribe! http://bit.ly/ACSReactions Facebook! http://facebook.com/ACSReactions Twitter! http://twitter.com/ACSReactions Instagram! https://www.instagram.com/acsreactions/ Tumblr! http://acsreactions.tumblr.com/ You might also like: Nose Blindness, Mouthwash, and Hand Sanitizer--Your Questions Answered https://youtu.be/VvtDzjlbUIA How Do We Know How Old the Earth Is? https://youtu.be/7cFYPYaD4zQ The One Where We Put Stuff in Acid https://youtu.be/cjN5yLvi_kA Tricking the Nazis and Transforming Medicine: George de Hevesy https://youtu.be/QjpKl4z5O2A Credits: Producer: Elaine Seward Writer: Alexa Billow Scientific Consultants: Sarah Don and Kent Molter Ph. D. Music: Alandra Lightflower Jones - Strike it up (82 style) Sam Leopard - Secret Bass Sources: Radioactive half life: https://hps.org/publicinformation/ate/q8270.html https://www.epa.gov/sites/production/files/2015-05/documents/402-b-04-001b-15-final.pdf Gold: http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/electrolysis/electrolysisrev2.shtml http://www.chm.bris.ac.uk/motm/chloroauric-acid/Chloroauric%20Acid.htm Ever wonder why dogs sniff each others' butts? Or how Adderall works? Or whether it's OK to pee in the pool? We've got you covered: Reactions a web series about the chemistry that surrounds you every day. Produced by the American Chemical Society.
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Mr. Andersen explains why radiation occurs and describes the major types of radiation. He also shows how alpha, beta, and gamma radiation affect the nucleus of a radioactive atom. Nuclear equations are also discussed. Intro Music Atribution Title: I4dsong_loop_main.wav Artist: CosmicD Link to sound: http://www.freesound.org/people/CosmicD/sounds/72556/ Creative Commons Atribution License
Просмотров: 289196 Bozeman Science
Subject: Geology Paper: Metamorphic and Igneous Petrology Module: Decay scheme of K-Ar, U-Pb, Rb-Sr and Sm-Nd isotopic systems; Petrogenetic implications of Rb-Sr and Sm-Nd isotopic systems Content Writer: Tapabrato Sarkar
Просмотров: 3909 Vidya-mitra
THIS VIDEO IS LACED WITH SARCASM (to those who have difficulty sensing it). Scientists admit that radiometric dating, one of the fundamental techniques used to show the earth is billions of years old is flawed!!! The earth is not 4.55 billion years old. Watch and find out just how old it really is. Of course, scientists are always refining their techniques, it's part of of science works. Creationists have pointed to a number of "results" from radiometric dating that prove it doesn't work. Here I go over all the reasons why. Why is there Carbon-14 in some coal. Why did Potassium-Argon dating of the 1980 eruption of Mount Saint Helens give ages on the order of hundreds of thousands of years. To download this video, copyright free, please go to: http://www.mediafire.com/?yytzwtrzmwh To download the scientific paper featured in this video please go to: http://www.mediafire.com/?mhljmmzn3m2 If you wish to translate the subtitles please download them from here: http://www.mediafire.com/?0mynummmyz0 And remember to always, Think about it.
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You can directly support Crash Course at http://www.subbable.com/crashcourse Subscribe for as little as $0 to keep up with everything we're doing. Also, if you can afford to pay a little every month, it really helps us to continue producing great content. In this episode, Hank welcomes you to the new age, to the new age, welcome to the new age. Here he'll talk about transmutation among elements, isotopes, calculating half-life, radioactive decay, and spontaneous fission. SUBBABLE MESSAGE: "To Crash Course From Shawn, Mike, Sophia, and Jake" "Thank you for using humor while educating and inspiring." -- Table of Contents Radioactivity Transmutation Among Elements and Isotopes Calculating Half-Life Radioactive Decay Spontaneous Fission -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Subbable: http://subbable.com/crashcourse
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To see all my Chemistry videos, check out http://socratic.org/chemistry Nuclear half life is the time that it takes for one half of a radioactive sample to decay. In this video, we will learn the basics of nuclear half life, and examine graphs and practice problems.
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Overview of the mechanics of radioactive decay as associated with radiometric or absolute rock dating. Coverage of key definitions (half-life, parent atom, daughter atom, etc). Steps for solving simple radiometric rock dating problems. "Your Call" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/
Просмотров: 29998 London Jenks
The use of radiometric dating to determine the absolute age of rocks & geologic materials. Uranium-lead dating and zircons, other radiogenic elements useful in geochronology. If you like these science videos please like, subscribe & share!
Просмотров: 4394 Earth.Parts
How do scientists determine the age of fossils that have been under the surface of the earth for thousands of years? Scientific American Editor Michael Moyer explains the process of radiocarbon dating. -- WATCH more Instant Egghead: http://goo.gl/CkXwKj SUBSCRIBE to our channel: http://goo.gl/fmoXZ VISIT ScientificAmerican.com for the latest science news:http://goo.gl/lHq0CH
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136 - Half-Life and Radioactive Decay In this video Paul Andersen explains how a radioactive nuclei can decay by releasing an alpha, beta, or gamma particle. The exact moment of decay for each nuclei can not be determined but probability is useful in predicting the half-life. The half-life is the amount of time required for half of the radioactive nuclei to decays and depends on the decay constant. Several examples of decay and several half-lives are included. Do you speak another language? Help me translate my videos: http://www.bozemanscience.com/translations/ Music Attribution Title: String Theory Artist: Herman Jolly http://sunsetvalley.bandcamp.com/track/string-theory All of the images are licensed under creative commons and public domain licensing: en.wikibooks, KieranMaher at. English: Illustration of the Concept of Half-Life, June 5, 2006. Generated by Kieran Maher using Microsoft Excel. http://commons.wikimedia.org/wiki/File:Half_Life.gif. Rosenkrantz, Kurt. English: Decay of an Imaginary Radioactive Substance with a Half-Life of One Year., July 27, 2010. http://cafreetextbooks.ck12.org/science/CK12_Earth_Science_rev.pdf (page 433) If the above link no longer works, visit http://www.ck12.org and search for CK-12 Earth Science. http://commons.wikimedia.org/wiki/File:Radioactive_decay.png.
Просмотров: 62544 Bozeman Science
Alpha, Beta, Gamma Decay and Positron Emission Watch the next lesson: https://www.khanacademy.org/science/chemistry/nuclear-chemistry/radioactive-decay/v/alpha-beta-and-gamma-decay?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Missed the previous lesson? https://www.khanacademy.org/science/chemistry/nuclear-chemistry/radioactive-decay/v/nuclear-stability-and-nuclear-equasions?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Chemistry channel: https://www.youtube.com/channel/UCyEot66LrwWFEMONvrIBh3A?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
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Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to find the half-life of nuclear decay of carbon 14 and uranium 238.
Просмотров: 12272 Michel van Biezen
How to solve half-life problems http://chemin10.com Determine the half-life of a radioactive isotope, the time taken to fall to half its original value. What is the half-life of an isotope and how to do half-problems. This lesson covers how to solve half-life problems, including solving for the half-life of a radioactive isotope, determining the amount remaining after a specified amount of time has passed, the original amount present, and the amount of time that has passed, the latter of which is used to determining the age of a fossil using carbon-14 dating. In this chemistry lesson, you will learn: how to read an exponential decay curve the half-life equation how to solve for amount of radioactive isotope remaining how to determine the half-life of an isotope how to determine the amount of time that has passed, given an initial and final amount of radioactive sample And solve these sample problems: The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed? Pd-100 has a half-life of 3.6 days. If one had 6.02 x 1023 atoms at the start, how many atoms would be present after 23.0 days? How many years will it take for 84.0 grams of tritium to decay to a 23.5 gram sample? (The half-life of tritium is 12.3 years.) You can learn more about how to find half-life of an isotope by visiting: http://www.chemteam.info/Radioactivity/Radioactivity-Half-Life.html To learn about radioactive decay, namely, alpha, beta and gamma decay, watch my video here: https://youtu.be/4FuvyIDM_eQ?list=PLQg9Ykih483GIlw7XGkZyuUT5Wi5YtRvS This video is created by an experienced Chemistry teacher for high school students who are looking to learn more about how to do half-life problems. We encourage you to share this video using this web address: http://youtu.be/Jhn_vc7av7A To subscribe to our channel for more useful videos related to high school Chemistry simply visit: https://www.youtube.com/user/CheminTen half-life problems how to do half-life problems how to solve half-life problems half-life of an isotope how to find half-life what is the half-life chemistry lessons what is the half-life of an isotope how to do half-life problems how to solve half-life problems how to find half-life half-life of radioactive isotopes half-life of an isotope
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Просмотров: 35 Simone Seagle
Secular equilibrium is the state in which all radioactive decay chain products have accumulated to their respective equilibrium amounts, so that each nuclide decays at the same rate as the original ancestor nuclide. This is state of any uranium ore rock that has been undisturbed over geological ages. Secular equilibrium is easy to understand if you use a dripping container model to represent each unstable product in the decay chain. Each container fills up to the level at which the rate of production exactly matches the rate of decay. When all containers in the chain reach their own equilibrium levels, the whole chain is in secular equilibrium. Part 2 of the presentation (https://youtu.be/OZtkb120HnI) explains how the amount of water accumulated in each container is related to the container's half-life. From this, you can determine the exact amount of each nuclide that exists in the uranium-bearing rock sample. Here are some useful links for additional information about secular equilibrium and radioactive decay: Secular Equilibrium in Radioactive Decay Chains (website) http://ataridogdaze.com/science/secular-equilibrium.html Difference Between Half-Life and Average Life, with Problem Examples http://ataridogdaze.com/science/half-life.html Calculation of Decay Activity of One Gram of Natural Uranium http://ataridogdaze.com/science/uranium-decay-rate.html Carbon-14 and Radiocarbon Dating http://ataridogdaze.com/science/carbon-14.html Origin of Atmospheric Argon http://ataridogdaze.com/science/potassium40-to-argon40.html Note: To make this presentation more user-friendly to non-technical viewers, I avoided using the term "Becquerels" (abbreviation: Bq), which means simply "atoms per second". Therefore, 1 gram of U-238 decays at a rate of 12,000 Bq or 12 kBq. Is Secular Equilibrium the Same as True Equilibrium? No, the amounts of the nuclides at the two ends of the chain are not constant. At the top of the chain, the U-238 is disappearing at a rate of 12,000 atoms per second. At the bottom of the chain, stable lead-206 is accumulating at 12,000 atoms per second. So this is not true equilibrium. However, secular equilibrium means no change over the ages. When dinosaurs roamed the earth 65 million years ago, the U-238 in this rock was decaying at 12,000 atoms per second, just as it is now. The amount of U-238 decreased by only 1% over that period of time. So you can see that during the existence of humans, and even recent geological history, the decay rate can be considered constant.
Просмотров: 6467 G Chang
Depleted uranium (DU) is obtained by processing mined uranium ore. Most of the radioactive isotopes extracted from the ore are used for nuclear weapons or atomic power plants. What remains is a less radioactive isotopeto 238, ie depleted uranium. It is almost two times denser than lead and flammable at impact, which makes it extremely effective when penetrating the armour. Miltary experts have in 1970s started to embed DU into the nozzles of conventional nuclear projectiles, granades and bullets. Every projectile contains about 350 grams of DU and that part of the projectile is called a “penetrator”. When a uranium “penetrator” hits a tank, the “penetrator” and the armour partially soften under the pressure. According to Pentagon’s literal description, a depleted uranium projectile goes through a tank like “a hot knife through butter”. There are disagreements about the scale of danger that DU poses. Experts agree that toxic and radiological risk is increased by DU’s property to split into fine dust that remains in the nature or in the human body for a very long time. “Only one particle of DU in the lymph glands can destroy the whole immune system”, said doctor Rodger Coghill at the London conference dedicated to the connection between DU and cancer diseases in Iraq. Production Synopsis All rights received
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"What Is Radiometric Age Dating Radiometric dating problems with the assumptions. National park service). Radiocarbon dating is a method used to determine the age of organic material by measuring radioactivity its carbon content radiometric. Radiometric dating! usgs geology and geophysicsdo you believe radiometric dating is an accurate way to date the ( read ) ck 12 foundation. Radiometric dating wikipedia. Learn science radiometric age dating youtube. Answers in accuracy of fossils and dating methods actionbioscience the way it really is little known facts about radiometric time scale. Oct 2018 radiometric dating calculates an age in years for geologic materials by decay occurs when the nucleus of a radioactive atom 1 2009 once you understand basic science dating, is helpful analogy to explain how geologists calculate ages rocks some skeptics believe that all fossils are same. The radiometric dating game unc computer science. Dating rocks and fossils using geologic methods. Evolutionists often misunderstand the method, assuming it gives a definite age for Radiometric dating methods, uses & significance of half life radiometric understanding evolutiondefine at dictionary. Radiometric dating is also used to date archaeological materials, including ancient artifacts 9 jan 2014 radiometric a method rocks and other objects based on the known decay rate of radioactive isotopes. Radiometric dating has been used to determine the ages of earth, moon, meteorites, how do we age a rock? Principles radiometric rocks and minerals (using uranium decaying produce helium could you also please explain further what is it commonly in earth science rock formations or 24 feb 2012 process using concentrations radioactive substances daughter products estimate material 11 1998 methods calculations based on decay rates elements such as uranium, basic theory briefly reviewed. Otherwise older fossils cannot be dated by carbon 14 methods and require radiometric dating 23 sep 2002 long age geologists will not accept a date unless it matches their pre existing expectations 13 jun 2001 although boltwood's ages have since been revised, they did show correctly that the precise has accomplished 1950 25 apr 2017 clocks are 'set' when each rock forms. Radiometric dating methods, uses & the significance of half life radiometric understanding evolutiondefine at dictionary. Since 1955 the estimate for age of earth has been based on assumption that certain 12 sep 2016 radiometric dating is a much misunderstood phenomenon. Radiometric dating age of earth creation. Radiometric age dating geology (u. Geologists use radiometric dating to estimate how long ago rocks formed, and infer the ages of fossils contained within those any method determining age earth materials or objects organic origin based on measurement either short lived radioactive elements amount a element plus its decay product using relative methods, geologists are able answer third, magnetism in can be used fossil site 26 may 2012. Radiometric dating is it accurate? Creation today. Radiometric dating or radioactive is a technique used to date materials such as rocks carbon, in which trace impurities were selectively incorporated when they formed."
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Subject: Geology Paper: Metamorphic and Igneous Petrology Module: Petrogenetic implications of Rb-Sr and Sm-Nd isotopic systems Content Writer: Tapabrato Sarkar
Просмотров: 2226 Vidya-mitra
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the energy released in an alpha decay.
Просмотров: 11786 Michel van Biezen
Updated version w/ better sound. For anyone interested in radiometric dating and the age of the earth. This is an overview presentation of Dr. Walt Brown's online chapter on radioactivity's origin on earth. The information in this presentation shows the problems with using radiometric decay as an indicator of earth's age. This is based on his hydroplate theory of how the earth experienced a global flood as described in Genesis 6-9 (the flood of Noah). For more information about this subject and the hydroplate theory visit the Center for Scientific Creation website at: www.creationscience.com/onlinebook, key words hydroplate theory, Walt Brown, radioactivity, radiometric decay, old earth, age of the earth, zircons, uranium, radiometric lead, U238, Pb206, origins, catastrophic, plate, tectonics, lightning, hydro, plate, proton, neutron, super heavy elements, Bill Maher and Bill Nye should study hydroplate theory before declaring the Flood of Noah to be a children's fairytale. For more information on the HPT check out Dr. Walt Brown's http://creationscience.com and Real Science Radio's http://rsr.org/hydroplate-theory resource page.
Просмотров: 6105 Bryan Nickel
The nucleus of radioactive material, emits three different types of radiation rays called alpha, beta and gamma. Alpha rays carry particles originating from the nucleus of a radioactive atom. These particles consist of two protons and two neutrons. Beta rays are a stream of negatively charged electrons. Gamma rays are pure energy. Because a gamma ray has neither mass nor charge, it remains unaffected by the magnetic field. The video is a contextualized and translated version (suitable for Indian audiences) of the original Engineering Technology Simulation Learning Videos (linked below). The original license allows the use of this video under CC-BY-NC domain of creative commons community. Hindi Script: Ranu Gupta Voiceover: Gopesh Kaushik Editor (Script and video): Ankit Gupta LIL website: https://www.learnindialearn.com ETSLV Video: https://www.youtube.com/watch?v=KYDil96NR5Q
Просмотров: 66890 Learn India Learn
Radiometric dating methods rely upon circular logic, such as calibration curves and dating fossils by rocks by strata by fossils by rocks by strata. When employing dating methods, evolutionists toss out dates which dissagree with the assumed age of something only to publish the date that seems to come closest to their assumption. You are never told about the dates which dissagreee with their assumptions. They are not scientific and ignora several scientific observations which make it clear that they are worthless. The Unikaret lava formation near the bottom of the Grand Canyon has been dated at 10,000 YA 117 MYA 1.39 BYA 2.6 BYA 853 MYA 1.1 BYA 715 MYA The University of Arizona has discovered Native American tools have been found in the lava Unikaret lava formation, which they state were put there between 800-1,000 yrs old. Samples from the 1986 dacite flow on Mount St Helens, Washington were K-Ar tested to a date of 350,000 years old! answersingenesis . o r g / tj / v10 / i3 / argon . a s p Mt Ngauruhoe erupted several times in the past 25-50 years and several of these samples have been K-Ar dated to ages of 250,000 -- 3,500,000 years old! This is an 1,000,000% error! answersingenesis . o r g / creation / v22 / i1 / dating . a s p Diamonds are the hardest substance known and can not be penetrated with contaminants. Evolutionists teach diamonds formed millions or billions of years ago out of carbon deep in the crust. If this is true than the radioactive 14C should be undetectable after 100,000 due to its fast decay rate. Diamonds were sampled from 12 locations all over the world and they contained measurable amounts of 14C. icr . o r g / carbon-14 / CreationismCoal supposedly formed millions or hundreds of millions of years ago according to evolutionists but coal samples have also been tested and they also contain measurable amounts of 14C. These results support what the Bible says about the young age of the Earth and the world wide flood. icr . o r g / rate / Radiometric dating methods use a material of pressumed age as a control for calibration, such as a rock of assumed age or an index fossil (of assumed age). There is nothing imperical about dating methods. To this are added "fudge factors". Dating methonds are circular logic and incapable of dating anything because they do not use a material of empirically known age for calinration, and are therefore incapable of providng a date for anything. The sun produces C-14 in the upper atmosphere, and at the same time it decays which removes it from the Earth. Because the Earth has not acheived C-14 equalibrium but is instead still increasing, which would take approximately 30,000 yrs, C-14 verifies the fact that the Earth is less than 30,000 yrs old.
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Thanks to all of you who support me on Patreon. You da real mvps! $1 per month helps!! :) https://www.patreon.com/patrickjmt !! Exponential Decay / Finding Half Life - In this video, I find the half life of a substance that is decreasing annually by 4%. For more free math videos, visit http://PatrickJMT.com
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Donate here: http://www.aklectures.com/donate.php Website video link: http://www.aklectures.com/lecture/radioactive-dating-of-wooden-artifact-example Facebook link: https://www.facebook.com/aklectures Website link: http://www.aklectures.com
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updated the radioactive mineral collection with 11 specimens ,box size 8cm x 6cm x 5cm 1.) Uraninite, Haje, dump #16, Pribram, Czech 2.) Tyuyamunite on Calcite, Cedar Mt. Utah , USA 3.) Autunite-Meta, Daybreak Mine, Washington, USA 4.) Strelkinite, Lisdan-Siwaga-Fault, Jordan 5.) Vandenbrandeite+ Cuprosklodowskite, Musonoi Mine, Kolwezi, Shaba Cu-Belt, Rep. Congo 6.) Umbozerite, Karnasurt Mt. Kola, Russia 7.) Liebigite Schwartzwälder Mine, Colorado, USA 8.) Andersonite, Monte Christo Mine, near Moab, Utah, USA 9.) Haiweeite Teofilo Otoni, Minas Gerais, Brazil 10.) Chernikovite+Metaautunite, Rockelmann Schwarzenberg, GDR 11.) Uranopilite on Coffinite/Pitchblende Matrix, Les Mares III, Lodeve, Languedoc Roussilon, France part I: https://www.youtube.com/watch?v=45H3JDGn-BQ part II: https://www.youtube.com/watch?v=G5GnLXRqr54 uraninite for sale: https://www.ioffer.com/selling/uraninite
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In this Physics (Radioactivity) video lecture in Hindi for class 12 we explained half life of a radioactive substance. Half life of a radioactive substance is defined as the time period in which nuclei of half of the atoms of that radioactive substance disintegrate. ************************************************** Click to visit the homepage of our channel : https://www.youtube.com/channel/UCG1-22fo1sIhXGuXYpTRqaA EduPoint, Dam Road, Chandil, Dist- Seraikela-Kharsawan, Jharkhand, India.
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