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  1. In vacuum, to travel distance d, light takes time t and in medium to travel distance
  2. A particle of mass m moves with constant speed along a circular path of radius r under
  3. Three objects coloured black, gray and white can withstand hostile conditions upto 2800⁰C.
  4. A wire of a certain material is stretched slowly by ten percent. Its new resistance
  5. If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be