Dual Nature of Matter

JEE Main level, single correct, medium

122 of 200

Question 122 of 200

For the photoelectric effect, the maximum kinetic energy (Ek)\left({E}_{k}\right) of the photoelectrons is plotted against the frequency (v)(v) of the incident photons as shown in figure. The slope of the graph gives

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Answer: (D) Planck’s constant

Comparing Einstein's equation Kmax⁡=hv−hv0,{K}_{\max }=hv-h{v}_{0}, with y=mx+c,y=mx+c, we get slope, m=hm=h, which is Planck’s constant.

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