JEE Main · 2019 · 10 Jan 2019 · Shift 1 · Atomic Structure

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Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?

(A)(see graph)
(B)(see graph)
✓ Correct
(C)(see graph)
(D)(see graph)

Answer: (B)

Solution

Einstein's photoelectric relation

K E = h ν - h ν_{0}

is a straight line of kinetic energy against frequency, with positive slope

h

and an intercept fixed by the threshold frequency, and it carries no feature that would bend or invert that line. The graph showing a relationship the equation forbids, where the ejected-electron quantity varies with the incident light in a way the linear law does not allow, is the one that fails to represent the effect.

JEE Main · 2019 · 10 Jan 2019 · Shift 1 · Single correct option

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