The threshold wavelength for photoelectric emission from a material is

PHYSICS · Multi correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

The threshold wavelength for photoelectric emission from a material is 5200 A˚5200\text{ \AA}. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a (1) 50 W50\text{ W} infrared lamp (2) 1 W1\text{ W} infrared lamp (3) 50 W50\text{ W} ultraviolet lamp (4) 1 W1\text{ W} ultraviolet lamp

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