MHT CET 2024 Physics question

Physics Dual Nature of Matter and Radiation MHT CET 2024

In case of photoelectric effect, the graph of measured stopping potential against frequency 'v' of incident light is a straight line. The slope of this line multiplied by the charge of electron (e) gives

(A)the work function of the metal.
(B)the Planck's constant.Correct
(C)the maximum kinetic energy of the ejected electrons.
(D)the threshold frequency for photoejection from the metal.

Answer: (B)

Solution

Einstein's equation: and , so . This is a straight line of slope in the - graph. Hence slope , the Planck's constant,

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Question ID VK-096607