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  1. The mean free path of molecules of a gas,(radius ‘r’) is inversely proportional to
  2. In refraction, light waves are bent on passing from one medium to the second medium
  3. An engine has an efficiency of 1/6. When the temperature of sink is reduced
  4. Which of the following statements is correct?
  5. Two bodies A and B having temperature 327° C and 427° C are radiating heat