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  1. In a diffraction pattern due to a singleslit of width a, the first minimum is observed
  2. In a capillary tube water raises by 1.2 mm. The height of water that will rise
  3. If the radioactive dacay constant of radium is 1.07 x 10⁻⁴ year⁻¹, then its half-life
  4. The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
  5. Masses of 3 wires of same metal are in the ratio 1:2:3 and their lengths