| Assertion (A): Resolving power of electron microscope increases as electron is accelerated through higher voltage. |
| Reason (R): de-Broglie wavelength of electron decreases as accelerating voltage of electron increases. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
| Option [a] is correct |
| Explanation: de-Broglie wavelength is given \[\lambda =\frac{h}{\sqrt{2me\operatorname{V}}}\] |
| So, as accelerating potential (V) increases, the wavelength decreases. |
| Resolving power of microscope = \[=\frac{2\mu \sin \beta }{1.22\lambda }\] |
| So, as wavelength \[(\lambda )\] decreases, resolving power increases. |
| So, assertion and reason both are true and reason explains the assertion. |
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