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  1. A boy standing at top of a tower of 20 m height drops a stone
  2. If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
  3. The maximum and minimum intensities of two sources is 4:1. The ratio of amplitude is
  4. If A=4i+4j+4k and b=3i+j+4k, then angle between vectors A and B is
  5. A particle covers half of its total distance with speed v1 and the rest half distance