Question

In a nuclear reactor using $U$${}^{235}$ as a fuel , the power output is $4.8MW$. The number of fissions per second is (Energy released per fission $=$200MeV,1 eV $=1.6\times {10}^{-19}$J)

• A. 1.5x10${}^{17}$
• B. 3x10${}^{19}$
• C. 1.5x10${}^{25}$
• D. 3x10${}^{25}$

Answer 1

The correct option is A 1.5x10${}^{17}$

$P=4.8\times {10}^{6}J/S$

$4.8\times {10}^6=n\times 200\times 1.6\times {10}^{-13}$

$1.5\times {10}^{17}=n$