Questions
In an electron microscope, the accelerating voltage is increased from 20 kV to 80 kV. If resolving power of 20 KV is R, the resolving power for 80 KV is
a
R/2
b
1R
c
3R
d
2R
detailed solution
Correct option is D
From the electron, p22m=eV⇒p=2meV∴λ=hp=h2meV⇒λ∝1VNow resolving power R∝1λ⇒R∝V∴R1R=8020=2⇒R1=2RTalk to our academic expert!
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