NDA 2017 Physics question

If the potential difference applied to an X-ray tube is doubled while keeping the separation between the filament and the target as same, what will happen to the cutoff wavelength ?

(A)Will remain same
(B)Will be doubled
(C)Will be halvedCorrect
(D)Will be four times of the original wavelength

Answer: (C)

Solution

The most energetic X-ray photon has energy equal to the kinetic energy of the electron: , so . The

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Question ID VK-030763