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  1. When photons of energy hν are incident on the surface of photosensitive
  2. A boat of mass 40 kg is at rest.A dog of mass 4 kg moves in the boat
  3. A conductor of length 5 cm is moved parallel to itself with a speed of 2 m/s,
  4. If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
  5. If 20% of a radiactive element decays in 10 days, then amount of original material left