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  1. A black body is heated from 27° C to 127° C. The ratio of their energies of radiations
  2. The radioactivity of a certain material drops to 1/16 of the initial value in 2 hours.
  3. A body A experiences perfectly elastic collision with a stationary body B
  4. The velocity of molecules of a gas at temperature 120 K is v. At what temperature
  5. A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg