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If a hydrogen atom at rest, emits a phot...

If a hydrogen atom at rest, emits a photon of wavelength `lambda`, the recoil speed of the atom of mass m is given by :

A

`h/(mlambda)`

B

`(mh)/lambda`

C

`mhlambda`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
From conservation of linear momentum , after emission of a photon , magnitude of linear momentum of the atom=magnitude of linear momentum of photon i.e `mv=h/lambdaRightarrowv=h/(mlambda)`
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Knowledge Check

  • The rest mass of a photon of wavelength lambda is

    A
    Zero
    B
    `h// c lambda`
    C
    `h// lambda`
    D
    `hc//lambda`

  • The mass of photon of wavelength lambda is given by

    A
    `hlambdac`
    B
    `h//lambdac`
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    `hc//lambda`
    D
    `hlambda//c`

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    A
    `10^(-4) m//sec`
    B
    `2xx10^(-2) m//sec`
    C
    `4 m//sec`
    D
    `8xx10^(2) m//sec`

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