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Question

# The threshold wavelength for lithium is 5250Ao. For photo emission to take place, the wavelength of the incident light must be

A
More than 5250Ao
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B
Exactly equal to 5250Ao
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C
Equal to or more than 5250Ao
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D
Equal to or less than 5250Ao
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Solution

## The correct option is B Equal to or less than 5250AoThe threshold wavelength of a material signifies that if the photons of energy corresponding to this wavelength or higher strike onto the material, they will undergo photo electric effect. As the energy of a photon is inversely proportional to wavelength (E=hcλ), the photonic wavelength should be less than equal to threshold wavelength.Option-D is correct.

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