MHT CET 2024 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) is increased to times
(B) is increased to times
(C) is decreased to timesCorrect
(D) is decreased to times

Answer: (C)

Solution

An electron accelerated through a potential difference gains kinetic energy , so . The de Broglie wavelength is , i.e. (numerically Å). When is doubled,

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Question ID VK-096797