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A stream of electrons from a heated fila...

A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If c and m are charge and mass of an electron repectively, then the value of `h//lambda` (where `lambda` is wavelength associated with electron wave) is given by :

A

`2meV`

B

`sqrt(meV)`

C

`sqrt(2meV)`

D

`meV`

Text Solution

Verified by Experts

The correct Answer is:
C
According to de-Broglie, the wavelength associated with a particle of mass m, moving with velocity v is given by the relation
`lambda=(h)/(mv)" K.E."=(1)/(2)mv^(2)=eV," "m^(2)v^(2)=2eVm, mv=sqrt(2eVm)`
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