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The number of neutrons emitted when ""(9...

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

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The correct Answer is:
3
`""_(92) U^(235) + ""_(0) n^(1) to ""_(54) Xe^(142) + ""_(38) Sr^(90) + y(""_(1) n^(0)) , (235 + 1) = (142 + 90) + y`
`y = (236- 232) = 4` Net no. of .n. emitted = `(4 - 1)` = 3
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