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  1. The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second
  2. Two blocks of masses m₁=4 kg and m₂= 2kg are connected to the ends of a string
  3. For a parallel beam of monochromatic light of wavelength λ diffraction is produced
  4. Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear
  5. A block of mass m moving at a velocity v collides with another block of mass 2m