1. An excited 236 U 92 nucleus undergoes fission into two fragments, as describe

Question

1. An excited 236 U 92 nucleus undergoes fission into two fragments, as described by the following equation:

236 U 92 --> 144 Ba 55 + 92 Kr 36

The following atomic masses are known:

- 92 Kr 36     91.926270 amu

- 144 Ba 56     143.922845 amu

- 236 U 92     236.045563 amu

What is the reaaction energy? Let 1 amu = 931.5 MeV.

a) 170 MeV

b) 180 MeV

c) 160 MeV

d) 150 MeV

e) 190 MeV

2. The following is one of the fusion reactions that occurs in the sun:

1 H 1 + 2 H 1--> 3 He 2 + Y

The following atomic masses are known:

- 1 H 1     1.007825 amu

- 2 H 1     2.01410178 amu

- 3 He 2     3.016029 amu

What is the reaaction energy? Let 1 amu = 931.5 MeV.

a) 5.494 MeV

b) 8.017 MeV

c) 2.177 MeV

d) 3.488 MeV

Explanation / Answer

(i) 170 MeV (a)

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