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When two ultraviolet beams of wavelengths λ1 = 97.7 nm and λ2 = 115 nm fall...

When two ultraviolet beams of wavelengths λ1 = 97.7 nm and λ2 = 115 nm fall on a lead surface, they produce photoelectrons with maximum energies of 8.57 eV and 6.67 eV, respectively. (a) Estimate the numerical value of the Planck constant. (b) Calculate the work function and cutoff frequency of lead.

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