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  1. When a piece of metal is illuminated by a monochromatic light of wavelength λ,
  2. An isolated sphere has a capacitance of 50pF. What would be the radius of the sphere?
  3. If the minimum energy of photons needed to produce photoelectrons is 3 eV,
  4. A light of wavelength 5000Å falls on a sensitive plate with photoelectric work
  5. An interference pattern was made by using red light. If the red light