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  1. Two bubbles A and B (A>B) are joined through a narrow tube. Then
  2. α-particles, deuterons and protons of same energy are moving in a perpendicular
  3. The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element Y
  4. A black body at a temperature of 227⁰C radiates heat at a rate of 20 cal m⁻²s⁻¹.
  5. If the velocity of sound in air is 350 m/s, thent he fundamental frequency