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  1. A particle moving along a straight line OX.At a time (in second ) the distance
  2. The mean radius of the earth is R, its angular speed on its own axis is ?
  3. A thin prism of angle 15⁰ made of glass of refractive index µ₁ = 1.5 is combined
  4. If the wavelength of incident light falling on a photosensitive material decreases,
  5. In which of the follows decays, the element does not change?