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  1. The ratio of radii of planets A and B is K₁ and ratio of accelerations
  2. The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is
  3. A focal length of a lens is 10 cm. What is power of a lens in dioptre?
  4. A p-n-p transistor is used in common emitter mode in an amplifier circuit.
  5. A thin and circular disc of mass M and radius R is rotating in a horizontal plane