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  1. When sound is produced in an aeroplane with a velocity of 200 m/s horizontally,
  2. A system consists of three masses m₁, m₂ and m₃ connected by a string passing
  3. The condition for obtaining secondary maxima in the diffraction pattern
  4. A small rod of bismuth is suspended freely between the poles of a strong electromagnet.
  5. Huygen’s principle of secondary wavelets may be used to