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  1. A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
  2. Wavefront is the locus of all points, where the particles of the medium
  3. The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ v
  4. A point charge q is situated at a distance r on axis from one end of a thin
  5. In a laser tube, all the photons