1.

Assume that the nuclear binding energy per nucleon (BIA) versus mass number (A) is as shown in the figure. Use this plot to choose the correct choice(s) given below:

Answer»

Fusion of two NUCLEI with mass mumber lying in the range of `1 LT A lt 50` will release energy.
Fusion of two nuclei with mass numbers lying in the range of `51 lt A lt 100` will release energy.
Fission of a nucleus lying in the mass range of `100 lt A lt 200` will release energy when broken into two equal fragments.
Fission of a nucleus lying in the mass range of `200 lt A lt 260` will release energy when broken into two equal fragments.

Solution :Let US examine the four alternatives separately.
(a) For `1 lt A lt 50`, on fusion mass number of the resulting nucleus will be less than 100.
(b) For `51 lt A lt 100`, on fusion mass number of the resulting nucleus is between 100 and 200. B/A increases, energy will be released.
(c) On fission for `100 lt A lt 200`, the mass number for fission nuclei will be between 50 to 100. B/A decreases, no energy will be released.
(d) On fission for `200 lt A lt 260`, the mass number for fission nuclei will be between 100 to 130, B/A will increase, energy will be released.


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