What minimum potential must be applied on an electron microscope to view two point distinctively which are about 1.22 a apart?

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Text Solution

Solution : Here `lamda=0.4A=0.4xx10^(-10)m` <br> Let V be the required voltage. Then, <br> `lamda=(h)/(sqrt(2meV))` <br> or `lamda=(12.27)/(sqrtV)` (in A) <br> `0.4=(12.27)/(sqrtV)` <br> or `sqrtV=30.675` <br> or `V=(30.675)^(2)=940.96V`

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