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  1. Which one of the following statements is true, if half-life of a radioactive substance
  2. The specific charge of a proton is 9.6×10⁷ C/kg. The specific charge of an alpha particle
  3. The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz.
  4. When photons of energy hν are incident on the surface of photosensitive
  5. The conductivity in the intrinsic semiconductor does not depend on