Which one of the following is not correct?

$A$ $^{235}U$ nuclear reactor generates energy at a rate of $3.70 \times 10^7 \text{ J/s}$. Each fission liberates $185 \text{ MeV}$ of useful energy. If the reactor has to operate for $144 \times 10^4 \text{ s}$, the mass of the fuel needed is (Assume Avogadro's number $= 6 \times 10^{23} \text{ mol}^{-1}$, $1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}$) (in $\text{ kg}$)

What is a nuclear chain reaction? Explain the difficulties and their removal for its successful operation.

When neutrons are bombarded on the nucleus of $_{92}^{235}U$,the number of emitted neutrons is typically

The operation of a nuclear reactor is said to be critical when the value of the neutron multiplication factor $K$ is:

If each fission in a $U^{235}$ nucleus releases $200 \, MeV$, how many fissions must occur per second to produce a power of $1 \, kW$?