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Photo-electric effect. when two ultraviolet beams of wavelengths 21= 80
on a lead surface, they produce photoelectrons with maximum energies 11.390 ev and 7.154 ev,
respectivel
and 22= 110 nm fall
(a) Estimate the numerical value of the Planck constant.
(b) Calculate the work function, the threshold frequency and the threshold wave-length of lead.

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