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  1. The order of distance of an electron revolving in an atom from nucleus is
  2. A particle moves a distance x in time but according to equation x=(t+5)⁻¹
  3. Penetrating power of X-rays does not depend on
  4. One coolie takes 1 minute to raise a suitcase through a height of 2 m
  5. If oxygen has root mean square velocity of C m/s, then root mean square velocity of H