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  1. The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is
  2. In Young’s experiment, the ratio of maximum to minimum intensities of the fringe
  3. Moderator used in nuclear reactor is
  4. A particle of mass ‘m’ is kept at rest at a height 3R from the surface of earth
  5. The masses of three wires of copper are in the ratio 1:3:5 and lengths