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The number of neutrons accompanying the ...

The number of neutrons accompanying the formation of `._(54)Xe^(139)` and `._(38)Sr^(94)` from the absorption of a slow neutron by `._(92)U^(235)`, followed by nuclear fission is

A

0

B

1

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
D
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The number of neutrons in ""_(92)U^(235) is

The number of neutrons emitted when ""_(92)^(235) U undergoes controlled nuclear fission to ""_(54)^(142) Xe and ""_(38)^(90) Sr is

Assertion (A) Fragments produced in the fission of ""_(92)U^(235) are radioactive. Reason (R) The fragments in the fission of ""^(235)U have a proton to neutron ratio of 2.5.

Consider the fission of ._(92)^(238)U by fast neutrons. In one fission event, no neutrons are emitted and the final end products, after the beta decay of the primay fragments, are ._(58)^(140)Ce and ._(44)^(99)Ru . Calculate Q for this fission process. The relevant atomic and particle masses are m(._(92)^(238)U)=238.05079 u m(._(58)^(140)Ce)=139.90543 u m(._(44)^(99)Ru)=98.90594 u