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  1. A vibrating string of certain length l under a tension T resonates with a mode
  2. A block is moving up an inclined plane of inclination 60° with velocity of 20 ms⁻¹
  3. Parsec is the unit of
  4. The energy of the em waves is of the order of 15 keV. To which part of the spectrum
  5. The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν