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3.
When a metal is illuminated with light of wavelength 420 nm, the stopping potential is
0.65 V; when the wavelength of incident light is changed to 310 nm, the stopping potential is 1.69
V. Use these given data to find the work function of this metal in eV and a value of Planck's
constant h (speed of light = 3 × 10® m/s, electronic charge = -1.6 x 10-19 C).

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