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  1. When we hear a sound, we can identify its source from
  2. Surface tension of a solution is 30 x 10⁻² N/m. The radius of the soap bubble is 5 cm
  3. Radius of first orbit of the electron in a hydrogen atom is 0.53 Å. So the radius
  4. The moment of inertia of a semicircular ring about the centre is
  5. In photoelectric effect, the photoelectric current