Assume 1.00 kg 233U fission spontaneously and that the products are only ⁹2Rb, 128Cs and 3 neutrons per fission. What is the change in mass and what is the energy produced?
Assume 1.00 kg 233U fission spontaneously and that the products are only ⁹2Rb, 128Cs and 3 neutrons per fission. What is the change in mass and what is the energy produced?
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Transcribed Image Text:Assignement-2 Nuclear physics 1
Exercise
1
128 CS
Assume 1.00 kg 233U fission spontaneously and that the products are only ⁹2Rb,
and 3 neutrons per fission. What is the change in mass and what is the energy produced?
Exercise 2
A rare decay mode has been observed in which ²Ra emits a ¹4C nucleus.
222
(a) The decay equation is 222 Ra'n AX+14C. Identify the nuclide AX.
(b) Find the energy emitted in the decay. The mass of 222 Ra is 222.015353 u.
Exercise 3
(a) Write the complete B+ decay equation for ¹¹C.
(b) Calculate the energy released in the decay. The masses of ¹¹C and ¹¹B are
11.011433 and 11.009305 u, respectively.
Exercise 4
(a) Calculate the energy released in the a decay of 238 U.
(b) What fraction of the mass of a single 238U is destroyed in the decay? The mass of
234Th is 234.043593 u.
(c) Although the fractional mass loss is large for a single nucleus, it is difficult to
observe for an entire macroscopic sample of uranium. Why is this?
Exercise 5
2-A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85×10²
Bq.
(a) What is the present activity in mCi?
(b) How long ago did it actually have a 4.00-mCi activity?
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