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The threshold wavelength for photoelectr...

The threshold wavelength for photoelectric emission from a
material is `5200 Å`. Photoelectrons will be emitted when this material is
illuminated with monochromatic radiation from a
(a) 50 W infrared lamp
(b) 1 W infrared lamp
(c ) 50 W ultraviolet lamp
(d) 1 W ultraviolet lamp
.

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