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  1. If the velocity of sound in air is 350 m/s, thent he fundamental frequency
  2. The potential energy of particle in a force field is U = A/r² – b/r, where A and B
  3. The focal length of the objective of a terrestrial telescope is 80 cm
  4. If the temperature of the sun were to increase from T to 2T and its radius from R and 2R
  5. A uniform wire of resistance 9Ω is joined end-to-end to form a circle. Then