The fission bomb that was dropped on the Japanese city of Hiroshima in 1945 contained approximately 64 kg of $_{92}^{235} U$ and released an amount of energy equivalent to the explosion of approximately 15,000 tons of TNT (called ’15-keloton bomb’)
[Given, energy released by 1 ton of TNT $= 3.5 \times 10^{8} J$ ]

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All the 64 kg of $_{92}^{235} U$ undergoes fission

only 1% (nearly) out of 64 kg undergoes fission

the explosion can cause harmful release of energy known as nuclear holocaust

The destructive form of release of energy known as atomic bomb explosion gives large amount of energy in a very small interval of time

answer is C, B, D.

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Detailed Solution

1 ton of TNT releases energy $= 3.5 \times 10^{8} J$
15000 tons of TNT releases energy $= 15000 \times 3.5 \times 10^{8} J$
$= 52.5 \times 10^{11} J$
1 atom $= 200 \times 1.6 \times 10^{- 13} J$
$∴$ No of atoms $= \frac{52.5 \times 10^{11}}{200 \times 1.6 \times 10^{- 13}}$
$N = 16.4 \times 10^{22}$
$m a s s = (\frac{N}{N_{A}} \times 0.235) kg$
$= \frac{16.4 \times 10^{22}}{6.023 \times 10^{23}} \times 0.235 k g$
= 0.64 kg