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  1. The frequency of light ray having the wavelength 3000Å is
  2. The binding energy of deutron is 2.2 MeV and that of ₂⁴He is 28 MeV.
  3. A body oscillates with amplitude of 10 cm in a horizontal platform.
  4. A boy whirls a stone in a horizontal circle of radius 1.5 m and at height 2.0 m
  5. The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field