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  1. The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at time
  2. A radioactive sample S₁ having an activity of 5 μCi has twice the number of nuclei
  3. A body of mass m is placed on the earth’s surface. It is taken from the earth’s surface
  4. An electron of a stationary hydrogen atom passes from the fifth energy level to
  5. The ratio of the weight of a man in a stationary lift and when it is moving downwards