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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

2 meV

B

`sqrt(meV)`

C

`sqrt(2meV)`

D

`meV`

Text Solution

Verified by Experts

The correct Answer is:
C
As electron of charge .e. is passed through .V. volt, kinetic energy of electron becomes =.eV.
As wavelength of `e^(-)` wave `(lamda)=h/(sqrt(2m.K.E.))`
`lamda=h/(sqrt(2meV))`
`:. h/lamda=sqrt(2meV)`
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