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  1. A solenoid of length l metre has self inductance L henry. If number of turns
  2. What is the energy of photon whose wavelength is 6840 Å?
  3. A radioactive substance contains 10000 nuclei and its halflife period is 20 days
  4. The S.I. unit of radioactivity is
  5. A radioactive sample S₁ having an activity of 5 μCi has twice the number of nuclei