40K decays to 40Ar with a half-life of 1.3 billion years.  Argon is a gas, so 40Ar escapes into the atmosphere once it forms.  Suppose a sample of granite originally contained 20 g of 40K,  but it now contains only 5 g.  How many half-lives have passed?  How old is the rock?

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A: Alpha decay is a nuclear decay process where an unstable nucleus changes to another element by…

Q: Potassium (40K) decays to Argon (40Ar) with a half-life value of 1.3 billion years. 40K is the…

A: This problem can be solved using radioactive decay concept.

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A: We use the formula of rate of decay to get the required values.

Q: 40K decays to 40Ar with a half-life of 1.3 billion years.  Argon is a gas, so 40Ar escapes into the…

A:

Q: In a certain rock, the ratio of lead atoms to uranium atoms is 0.300.Assume that uranium has a…

A:

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A: Given: The half life time is 9.06 h.

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A: Carbon has generally three isotopes found in nature. Isotopes are those which have the same proton…

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A:

Q: Part a. Approximately how much mass remains after 8.0 hours? Part b. Approximately how much mass…

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A:

Q: 212, 86 Rn is an odorless gas which decays via alpha decay with a half-life of 24 minutes. a) What's…

A: Decay constant, λ =0.693half life time=0.693t1/2

Q: Potassium-argon dating is used to measure the age of rocks formed from cooled lava by determining…

A: Potassium-argon dating is an interesting way to measure the age of rocks formed from cooled lava. It…

Q: The half-life of Cs-137 is about 9.46*10^8 seconds. The decay constant (λ) is 7.33*10^-10 s^-1.  If…

A: Given that: T1/2=9.46×108 sλ=7.33×10-10 s-1At t=0, dNdtr=1000To determine the decay rate…

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A: Mass of Deuterium is given as = 2.014102 No of protons in hydrogen 1 = 1

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A: This question can easily be solved by applying the concept of radiocarbon dating .

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Q: You inherit 32 kg of cesium-136 after your roommate moves out and leaves it behind. Cesium-137 has a…

A: Initial mass of cesium (mo) = 32 kg half life of cesium (t1/2) = 30 years time (t) = 90 years

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Q: A radioactive element 235U is present in a Zircon sample with 3500 atoms. It is known that 235U has…

A: Here, y =350012t700Where t in million y =115 atoms now, y =350012t700    115…

Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.