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For the photoelectric effect, the maximum kinetic energy (E k ) of the photoelectrons is plotted against the frequency ( ν ) of the incident photons as shown in figure. The slope of the graph gives E k ν θ

1. Charge of electron
2. Work function of the metal
3. Ratio of Planck's constant to electric charge
4. Planck's constant

Correct answer: Planck's constant

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