Which graph correctly represents kinetic energy K of photoelectrons versus wavelength λ of incident light in photoelectric effect?
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Which graph correctly represents kinetic energy K of photoelectrons versus wavelength λ of incident light in photoelectric effect?

G1 Physics · Accepted Answer

Einstein equation gives K m a x = h c / λ − φ = h c ( 1 / λ − 1 / λ 0 ) . K_max=hc/λ-φ=hc(1/λ-1/λ₀). K m ​ a x = h c / λ − φ = h c ( 1/ λ − 1/ λ 0 ​ ) . Thus K decreases nonlinearly with λ and becomes zero at the threshold wavelength λ₀. This corresponds to graph (3).