An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be

Question

( A ) $\frac{24m}{24h R}$
( B ) $\frac{24m}{ 25h R}$
( C ) $\frac{25m}{24h R}$
( D ) $\frac{25m}{24h R}$