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What should be the velocity of an electr...

What should be the velocity of an electron so that its momentum becomes equal to that of a photon of wavelength 5200 Å ?

Text Solution

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`:.lamda=h//"mu"`
`:.` momentum of phton `="mu"=h//lamda`
`=(6.626xx10^(-34))/(5200xx10^(-10)kgm"sec"^(-1)`
Also, momentum fo electron =mu
`=9.108xx10^(-31)xxu kg m"sec"^(-1)`
Sicne both are same and thus equating the two
`9.108xx10^(-31)xxu=(6.626xx10^(-34))/(5200xx10^(-10))`
`:.u=1400m"sec"^(-1)`
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