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  1. The momentum of a body is increased by 20%.The percentage increases in kinetic energy
  2. A particle of mass 100g tied to a string is rotated along a circle of radius 0.5 m
  3. The number of beta particles emitted by a radioactive substance is twice the number
  4. The ratio of specific charge of an α-particle to that of a proton is
  5. A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV.