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  1. The number of photons of wavelength of 540 nm emitted per second by an electric bulb
  2. The number of photo electrons emitted for light of a frequency v
  3. what should be the velocity of an electron so that its momentum becomes equal
  4. A ray of light is incident on a transparent glass slab of refractive index 1.62
  5. A 70 kg man stands in contact against the inner wall of a hollow cylindrical drum