A hydrogen atom moving at a speed v(0) a...

A hydrogen atom moving at a speed `v_(0)` absorbs a photon of wavelength `61 nm` and stops. Mass of the hydrogen atom is `1.67xx10^(-27)kg`. When calculated `v_(0)` comes out to be `13/n m//s`. Find `n` nearly.

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The correct Answer is:

`1.67xx10^(-27)v_(0)=(6.62xx10^(-34))/(61xx10^(-9))impliesv_(0)=6.5m//simpliesn=2`

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