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Threshold wavelength for a metal is 5200 Å. The photoelectron will be ejected, if it is irradiated by light from: |
50 W infrared lamp 1 W infrared lamp 50 W ultraviolet lamp 0.5 W infrared lamp |
50 W ultraviolet lamp |
$Wavelength ∝ \frac{1}{Energy}$. Hence, wavelength should be smaller than threshold wavelength. |
