Photo-electric effect. when two ultraviolet beams of wavelengths 21 = 80 nm and h2 = 110 nm fall on a lead surface, they produce photoelectrons with maximum energies 11.390 eV and 7.154 ev, respectivel (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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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.
Transcribed Image Text: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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