Chapter 42: Q62P (page 1306)
A particular rock is thought to be 260 million years old. If it contains 3.70 mgof, how muchshould it contain? See Problem 61.
Short Answer
The rock should contain 0.13 mg of .
Chapter 42: Q62P (page 1306)
A particular rock is thought to be 260 million years old. If it contains 3.70 mgof, how muchshould it contain? See Problem 61.
The rock should contain 0.13 mg of .
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Get started for freeA measurement of the energy Eof an intermediate nucleus must be made within the mean lifetime of the nucleus and necessarily carries an uncertainty according to the uncertainty principle
.
(a) What is the uncertainty in the energy for an intermediate nucleus if the nucleus has a mean lifetime of? (b) Is the nucleus a compound nucleus?
The cesium is present in the fallout from aboveground detonations of nuclear bombs. Because it decays with a slow(30.2y)half-life , releasing considerable energy in the process, it is of environmental concern. The atomic masses of the Csand Baare 136.9058 uand, respectively; calculate the total energy released in such a decay.
a. Show that the massMof an atom is given approximately by , whereAis the mass number and is the proton mass. For (b) , (c),(d), (e) , and (f) , use Table 42-1 to find the percentage deviation between and :
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(g) Is a value ofaccurate enough to be used in a calculation of a nuclear binding energy?
Calculate the distance of closest approach for a head-on collision between an 5.30 MeV alpha particle and a copper nucleus.
The isotope can decay to either or ; assume both decays have a half-life of . The ratio of the Caproduced to Ar theproduced is 8.54/1 = 8.54. A sample originally had only. It now has equal amounts ofand; that is, the ratio of Kto Aris 1/1 = 1. How old is the sample? (Hint:Work this like other radioactive-dating problems, except that this decay has two products.)
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