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  1. A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
  2. Laser light is considered to be coherant because it consists of
  3. Light of two different frequencies whose photons have energies 1eV
  4. The number of beta particles emitted by a radioactive substance is twice the number
  5. A magnet of length 10 cm and magnetic moment 1 A-m² is placed