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  1. A 5 watt source emits monochromatic light of wavelength 5000Å. When placed
  2. A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
  3. In which of the following systems will the radius of the first orbit (n=1) be minimum?
  4. A ball is thrown vertically downwards from a height of 20 m with an initially
  5. Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ .