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Q.

Threshold wavelength of a photoelectric emission from a material is 600 nm. Which of the following illuminating source will emit Photoelectrons?

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a

100 W, ultraviolet lamp

b

400 W, infrared lamp

c

10 W, ultraviolet lamp

d

Both (2) & (3)

answer is D.

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Detailed Solution

The incident wavelength should be less than threshold wavelength for photoelectric emission. IR has wavelength more than 600 nm. UV has wavelength less than 600 nm. So, photoelectrons emitted when illuminated by UV lamp either 100 W or 10 W

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