Photons and Photoelectric Effect

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Introduction to Dual Nature

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Electron Emission

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Observations on Photo Electric Effect

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Experimental Study of Photoelectric Effect

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Photo Electric Effect of Light and Wave Theory of Light

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Planck's Photon Hypothesis

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Photon Energies

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Important Questions

The work function of caesium is 2.14 eV. Find  a) the threshold frequency for caesium and b) the wavelength of the incident light if photocurrent is brought to zero by stopping potential of 0.60 V.

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Monochromatic light of frequency Hz is produced by a laser. The power emitted is W
(i) What is the energy of the photon in the light beam?
(ii) How many photons per second, on an average are emitted by the source ? 

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 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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A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is ( Velocity of light)

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Which of the following phenomenon works on the particle nature of light?

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The photoelectric work function for a metal is . If the stopping potential is , find the threshold wavelength and maximum kinetic energy of emitted electrons.
(Velocity of light in air , Planck's constant , Charge on electron )

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Define threshold frequency.

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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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How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?

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Light of two different frequencies whose photons have energies 1eV and 2.5eV successively illuminate a metal of work function 0.5 eV.The ratio of the maximum speeds of the emitted electrons will he

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