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Two large parallel plates are connected ...

Two large parallel plates are connected with the terminal of `100 V` power supply. These plates have a fine hole at the centre . An electron having energy `200 eV` is so directed that it passes through the holes . When it comes out its de - Broglie wavelength is

A

`1.22Å`

B

`1.75Å`

C

`2Å`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
When it comes out from the second plate
E = 200 eV - 100 eV = 100 eV
Accelerating potential difference = 100 V
`lamda_e = (12.27)/(sqrtV) = 1.22 Å`
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