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  1. Two identical flutes produce fundamental notes of frequency 300 Hz at 27° C
  2. A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank
  3. A charge of 100 μC has a potential at a distance of 9 m is
  4. A linear aperture whose width is 0.02 cm is placed immediately in front of a lens
  5. A beam of light of λ=600 nm from a distant source falls on a single slit 1 mm wide