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  1. If two slits in Young’s experiment are 0.4 mm apart and fringe width on a screen
  2. A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms⁻¹.
  3. Light is emitted when
  4. When ₃Li⁷ nuclei are bombarded by protons, and the resultant nuclei are ₄Be⁸,
  5. Magnetism of a magnet is due to