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  1. The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
  2. When a metallic surface is illuminated with radiation of wavelength λ,
  3. The potential energy of a long spring when stretched by 2 cm is U.
  4. A p-n-p transistor is used in common emitter mode in an amplifier circuit.
  5. A particle moving along a straight line OX.At a time (in second ) the distance