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NEET - 2012

An electron of a stationery 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

(a)24 hR25 m                                (b)25 hR24m

(c)25m24hR                                 (d)24m25hR

(m is the mass of the electron, R Rydberg constant and h Planck's constant)

Here, E5-E1=hcλ

and R hc25-R hc =hcλ


But              P=hλ

and            v=hmλ


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