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  1. A soap bubble oscillates with time period T, which in turn depends on the pressure
  2. The half life of radium is 1620 yr and its atomic weight is 226 kg per kilo mol.
  3. The half-life of radioactive element is 600 yr. The fraction of sample
  4. A solid sphere is rotating in free space.If the radius of the sphere is increased
  5. A radioactive substance has a half-life of four months. Three-fourth of substance