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  1. A photon of wavelength 300nm interacts with a stationary hydrogen atom in ground
  2. A machine gun fires 10 bullets/s,each of mass 10 g,the speed of each bullet
  3. Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube.
  4. An ac voltage is applied to a resistance R and an inductor L in series
  5. A particle moving along a straight line OX.At a time (in second ) the distance