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  1. A body of mass 120 kg and density 600 kg/m³ floats in water.
  2. The threshold frequency for a photosensitive metal is 3.3 x 10¹⁴ Hz.
  3. A radioactive substance decays to 1/16th of its initial activity in 40 days.
  4. If a proton, a deuteron and an alpha particle, on being accelerated by the same
  5. Which one of the following bonds produces a solid that reflects light in the visible region