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  1. The velocity of radio-waves is 3×10⁵ km/s. The frequency corresponding to wavelength
  2. Two identical flutes produce fundamental notes of frequency 300 Hz at 27° C
  3. The magnifying power of a convex lens of focal length 10 cm, when the image
  4. If the series limit of Lyman series for hydrogen atom is equal to the series limit
  5. The magnetic lines of force inside a bar magnet