Chapter 42: Q. 14 (page 1236)
Use the potential-energy diagram in Figure to estimate the strength of the strong force between two nucleons separated by fm.
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Chapter 42: Q. 14 (page 1236)
Use the potential-energy diagram in Figure to estimate the strength of the strong force between two nucleons separated by fm.
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A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms. Two hours later, the numbers of the two atoms are equal. The half-life of A is . What is the half-life of B?
The radium isotope 226Ra has a half-life of 1600 years. A
sample begins with 1.00x1010 226Ra atoms. How many are left
after (a) 200 years, (b) 2000 years, and (c) 20,000 years?
A sample of 1.0x1010atoms that decay by alpha emission
has a half-life of 100 min. How many alpha particles are emitted
between t = 50 min and t = 200 min?
Nucleus A decays into nucleus B with a half-life of 10 s. At
t = 0 s, there are 1000 A nuclei and no B nuclei. At what time
will there be 750 B nuclei?
The plutonium isotope 239 Pu has a half-life of 24,000 years and decays by the emission of a 5.2 MeV alpha particle. Plutonium is not especially dangerous if handled because the activity is low and the alpha radiation doesn’t penetrate the skin. However, there are serious health concerns if even the tiniest particles of plutonium are inhaled and lodge deep in the lungs. This could happen following any kind of fire or explosion that disperses plutonium as dust. Let’s determine the level of danger.
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