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  1. The half-life period of a radio-active element X is same as the mean life time
  2. If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
  3. A car sounding a horn of frequency 100 Hz passes an observer. The ratio
  4. A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
  5. Suppose for some reasons, radius of earth were to shrink by 1% of present value,