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The potential difference V required for ...

The potential difference V required for accelerating an electron to have the de-Broglie wavelength of `1 Å` is

A

100 V

B

125 V

C

150 V

D

200 V

Text Solution

Verified by Experts

The correct Answer is:
C
de Broglie wavelenght ` lambda= (h)/(p) = (h)/(sqrt(2meV))`
`V = (h^2)/(2me lambda^2) = ((6.63 xx 10^(-34))^2)/(2xx 9.1 xx 10^(-31)xx1.6xx10^(-19)xx (10^(-10))^2)`
`=150.95 V ~~ 150 V.`
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