Plz expalin this ... photon of wavelength 122 nm and stops. the value of v is (mass of hydrogen atom = 167 x 102 ke) o a. 3.25 m/sec b.

A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. The value of v is (mass of hydrogen atom = 167 x 102 ke) O A. 3.25 m/sec B. 6.25 m/sec E O C. 9.25 m/sec D. 12.25 m/sec jee