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  1. The half life of radium is about 1600 year. Of 100 gram of radium existing now
  2. The time period of a simple pendulum in a lift descending with constant acceleration g is
  3. A proton and helium nucleus are shot into a magnetic field at right angles to the field
  4. Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV.
  5. Two sources of sound placed close to each other are emitting progressive waves