Nuclear Power Engineering
Fission of U-235 on slow neutron bombardment can be represented by

92U235 + 0n1 → 56Ba143 + 36Kr90 + 3 0n1
92U235 + 0n1 → 56Ba143 + 36Kr90
92U235 + 0n1 → 92U236 + 3 0n1+ Q (energy)
92U235 + 0n1 → 56Ba143 + 36Kr90 + 3 0n1 + Q (energy)

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Nuclear Power Engineering
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

It will completely disintegrate in four months
L/8th of it will remain intact at the end of four months
3/4th of it will disintegrate in two months
It will completely disintegrate in two months

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