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  1. A radiactive substance emits 100 beta particles in the first 2s and 50 beta
  2. An explosion blows a rock into three parts. Two parts go off at right angles to each other
  3. Dependence of intensity of gravitational field (E) of earth with distance(r)
  4. For principal quantum number n=3, the possible values of orbital quantum number
  5. The maximum particle velocity in a wave motion is half the wave velocity.