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Question

Assertion :If the potential difference applied to an electron is made 4 times, the de Broglie wavelength associate halved. Reason: On making a potential difference 4 times, velocity is doubled and hence λ is halved.


Read the above assertion and reason and choose the correct option regarding it.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The de Brogile wavelength
λ = hmv
v=2mKE=2meV

If the potential difference applied to an electron is made 4 times, the de Broglie wavelength associate halved because by making a potential difference 4 times velocity become doubled and hence wavelength is halved.

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