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# If Light of Wavelength 412.5 Nm is Incident on Each of the Metals Given Below, Which Ones Will Show Photoelectric Emission and Why? - CBSE (Science) Class 12 - Physics

ConceptPhotoelectric Effect and Wave Theory of Light

#### Question

If light of wavelength 412.5 nm is incident on each of the metals given below, which ones will show photoelectric emission and why?

 Metal Work Function (eV) Na 1.92 K 2.15 Ca 3.20 Mo 4.17

#### Solution

Energy of a photon of the given light is, E = 1240/lambda = 3 ev

Thus, metals having work-function less than energy of photon of falling light will show photoelectric effect. So, Na and K will show photoelectric effect.

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Solution If Light of Wavelength 412.5 Nm is Incident on Each of the Metals Given Below, Which Ones Will Show Photoelectric Emission and Why? Concept: Photoelectric Effect and Wave Theory of Light.
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