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  1. A source of unknown frequency gives 4 beats/s, when sounded with a source harmonic
  2. The de-Broglie wavelength of neutron in thermal equilibrium at temperature T is
  3. A spherical planet has a mass Mp and diameter Dp. A particle of mass
  4. Two metal spheres of radii 0.01m and 0.02m are given a charge of 15mC and 45mC
  5. A paramagnetic sample shows a net magnetisation of 0.8 Am⁻¹, when placed