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  1. A boy standing at top of a tower of 20 m height drops a stone
  2. A source and an observer approach each other with same velocity 50 m/s. If the frequency
  3. The electron of a hydrogen atom revolves round the proton in a circular
  4. A radio isotope X with a half life 1.4 x 10⁹ years decays to Y which is stable
  5. The Rutherford scattering experiment proves that an atom consists of