Question

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

• A. 10 microgram
• B. 20 microgram
• C. 40 microgram
• D. 1 microgram

Answer 1

Answer: (C)

40 microgram

Answer 2

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