MHT CET 2022 Physics question

If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change?

(A)Wavelength is increased to times
(B)Wavelength is decreased to times
(C)Wavelength is decreased to timesCorrect
(D)Wavelength is increased to times

Answer: (C)

Solution

For an electron accelerated through a potential difference , , so . When is doubled, , i.e. the wavelength decreases to

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Question ID VK-095896