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  1. Three objects coloured black, gray and white can withstand hostile conditions upto 2800⁰C.
  2. Monochromatic light of wavelength 667 nm is produced by a helium neon laser
  3. A solid body rotates about a stationary axis, so that its angular velocity
  4. The shortest wavelength in Lyman series is 91.2 nm. The largest wavelength
  5. Two sound waves of wavelengths 5m and 6m formed 30 beats in 3 seconds