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  1. Heat is flowing through a rod of length 50 cm and area of cross-section 5 cm².
  2. In the experiment for determination of velocity of sound in air,
  3. In an electrical circuit R,L,C and an AC voltage source are all connected in series.
  4. If the velocity of sound in air is 350 m/s, thent he fundamental frequency
  5. A black body radiates 20 W at temperature 227⁰C. It temperature of the black body