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  4. The power obtained in a reactor using U235 disintegration is 1000 kW. The mass decay of U235 per hour is

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Q. The power obtained in a reactor using $U^{235}$ disintegration is $1000\, {kW}$. The mass decay of $U^{235}$ per hour is

AIPMTAIPMT 2011Nuclei

Solution:

$E = Pt = mc ^{2}$
$m =\frac{ Pt }{ c ^{2}}=\frac{10^{6} \times 3600}{\left(3 \times 10^{8}\right)^{2}}$
$m =40 \,\mu gm$