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in Dual Nature of Radiation and Matter by (26.7k points)
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Einstein got Nobel Prize in 1921 for his explanation of photoelectric effect.

1. In order to start photoelectric emission, the minimum energy acquired by free electron in the metal is called as……

2. The minimum energy for the emission of an electron from metallic surface is given below

Na: 2.75e V K: 2.3e V Mo: 4.17e V Ni: 5.15e V Select the metal which is more photo sensitive. Why?

3. Draw variation of photoelectric current with applied voltage for radiation of intensities I1 and I2 (I1 > I2). Comment on the relatiion between intensity of light and photoelectric current.

4. Does Light from a bulb falling on an iron table emit photo electron? Justify your answer

1 Answer

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1. Work function/ Threshold energy.

2. K is more photosensitive because it has less work function.

As intensity increases photoelectric current also increases.

4. No. The work function of iron is very large.

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