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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 `17.5 xx 10^(-12)` m, the minimum electron energy required is close to:

A

1keV

B

5keV

C

500 keV

D

100 keV

Text Solution

Verified by Experts

The correct Answer is:
B
`lamda = (h)/(mV) = (h)/(sqrt(2mE)) = (12.27)/(sqrtV) A^@ rArr 0.175 = (12.27)/(sqrtV) rArr sqrtV = (12270)/(175) rArr V = (70)^2 = 4900 V rArr E~ 5keV`
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