Experimental Study of Photoelectric Effect

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Observations on Photo Electric Effect

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Experimental Study of Photoelectric Effect

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Important Questions

 Light of frequency 1.5 times the threshold frequency is incident on photosensitive material. If the frequency is halved and intensity is doubled, the photo current becomes

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Draw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.

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Write four laws of photoelectric effect.

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What is photoelectric effect? Explain the effect of increase (i) frequency (ii) intensity of incident radiation on photoelectric current with suitable graphs.

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(a) Why photoelectric effect cannot be explained on the basis of wave nature of light? Give reasons.
(b) Write the basis features of photon picture of electron magnetic radiation on which Einstein's photoelectric equation is based.

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In photoelectric effect, the photo current.

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Write the experimental observations of Photoelectric effect.

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The threshold frequency for certain metal is . If light of frequency is incident on the metal, then the cut-off voltage of the photoelectric current will be :

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The given graph shows the variations of photo-electric current (I) versus applied voltage (V) for two different photosensitive materials and for two different intensities of the incident radiations. Identify the pairs of curves that correspond to different materials but same intensity of incident radiations 

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If the frequency of light incident on metal surface is doubled, then the kinetic energy of emitted electrons will become

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