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Threshold wavelength for lithium metal i...

Threshold wavelength for lithium metal is 6250 Å. For photo emission, the wavelength of the incidennt light must be

A

more than 6250 `Å`

B

exactly equal to 6250 `Å`

C

equal to or more than 6250 `Å`

D

eaual to or less than 6250 `Å`

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The correct Answer is:
D
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