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  1. A point source emits sound equally in all directions in a non-absorbing medium.
  2. In a nuclear reactor, the number of U²³⁵ nuclei undergoing fissions per second
  3. α-particles, deuterons and protons of same energy are moving in a perpendicular
  4. Two bodies A and B have masses 20 Kg and 5 Kg respectively. Each one is acted
  5. A circular disc of radius R is removed from a bigger circular disc of radius 2R