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  1. The angle of a prism is A. One of its refracting surfaces is silvered
  2. In the phenomenon of electric discharge through gases at low pressure,
  3. The rest mass of a body is m1. It moves with a velocity of 0.6c, then its relativistic
  4. A photon of wavelength 300nm interacts with a stationary hydrogen atom in ground
  5. The half life of radioactive isotope ‘X’ is 50 years. It decays to