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  1. A radiation of energy ‘E’ falls normally on a perfectly reflecting surface
  2. A force F=ai+3j+6k is acting at a point r=2i-6j-12k. The value of α for
  3. A particle of mass m is projected with a velocity v making an angle of 45°
  4. The coefficient of performance of a Carnot refrigerator working between 30⁰C and 0⁰C is
  5. what is the de-Broglie wavelength of the electron accelerated through a potential