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  1. An a.c. supply gives 30 volt r.m.s which passes through a 10Ω resistance.
  2. Light of wavelength 500 nm is incident on a metal with work function 2.28 eV.
  3. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface
  4. Wave nature of light is verified by
  5. The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number