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Related Questions

  1. which of the following can not be emitted by radioactive substances during their decay?
  2. The half life of radioactive isotope ‘X’ is 50 years. It decays to
  3. When indensity of radiation is increased on a photosensitive plate, then
  4. A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field
  5. If the focal length of a concave mirror is 50 cm, then where should the object