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  1. The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is
  2. Maximum kinetic energy of electrons emitted in photoelectric effect increases when
  3. Hard X-rays for the study of fractures in bones should have a minimum wavelength
  4. In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given
  5. Before using the tangent galvanometer, its coil is set in