In a photoelectric experiment

PHYSICS · Multi-part · Fermi University Physics · Scientific Practice & Experimental Methods · Optics & Photonics · Data analysis and model fitting in the laboratory

Optics and Photonics, Ch The photon

Problem

In a photoelectric experiment, the stopping potential VsV_s was measured for two metal photocathodes, A and B, at two frequencies of the illuminating light. The data lie on two straight lines of the same slope: Metal A: Vs=0.50V_s = 0.50 V at ν=6.00×1014\nu = 6.00\times10^{14} Hz; Vs=1.74V_s = 1.74 V at ν=9.00×1014\nu = 9.00\times10^{14} Hz. Metal B: Vs=0.10V_s = 0.10 V at ν=6.00×1014\nu = 6.00\times10^{14} Hz; Vs=1.34V_s = 1.34 V at ν=9.00×1014\nu = 9.00\times10^{14} Hz. ((a)) Use the data for metal A to find Planck's constant hh from the slope of the line of VsV_s against ν\nu, and check that the same slope fits metal B. ((b)) Find the work function WW of metal A, in electron-volts. ((c)) Predict the stopping potential of metal A when illuminated at λ=400\lambda = 400 nm.

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