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In an electron microscope, the resolutio...

In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of `7.5 xx 10^(-12)` m, the minimum electron energy required is close to :

A

500 KeV

B

25 KeV

C

1 KeV

D

100 KeV

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda(Å) =sqrt((150)/V)rArr7.5 xx10^(-2)=sqrt((150)/V)`
`V=150/(7.5xx7.5xx10^(-4))=80/3 KeV`
Nearby value is 25 KeV .
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