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  1. Laser beams are used to measure long distance because
  2. In Young’s double slit experiment, when wavelength used is 6000Å and the screen
  3. A particle is executing SHM along a straight line. Its velocities at distances
  4. A polished metal plate has a rough and black-spot. It is heated to 1400 K
  5. Energy bands in solids are a consequence of