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  1. A cyclotron is used to accelerate
  2. A source is moving towards an observer with a speed of 20 m/s and having frequency
  3. A bullet of mass 0.05 kg moving with a speed of 80 m/s enters a wooden
  4. A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils.
  5. When the angle of incidence is 60° on the surface of a glass slab, it is found