1.

Lenard and Hallwachs investigated the phenomenon of photoelectric effect in details during 1886-1902 through experiments1. Write any two characteristic features observed in the above experiment?2. Explain with reasonGreen light emit electron from certain metal surface while yellow light does notWhen the wavelength of incident light is decreased, the velocity of emitted photo electrons increases3. Complete the following statement about photoelectric effect.The radiations having minimum frequency called…….falls on a metallic surcace, electrons are emitted from it. The metal which emits photo electrons are called………The kinetic energy of photo electrons emitted by a metal depends on………of the radiations, while intensity of the incident radiations depends on………

Answer»

1. Any two statement of laws of photoelectric effect.

2. Explain with reason:

  • Energy of incident photon is inversely proportional to its wavelength. Since λ of green light is less than that of yellow, it has larger energy. So it can emit photo electrons 
  • As the wavelength decreases, frequency and hence energy of incident radiation increases and hence kinetic energy of photo electrons increases.

3. Threshold frequency, photosensitive frequency, number of photons.


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