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  1. The photoelectric threshold frequency of a metal is ν. When light of frequency 4ν
  2. A step-up transformer operates on a 230 V line and supplies a current of 2 A.
  3. The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights
  4. A national roadway bridge over a canal is in the form of an arc of a circle of radius
  5. An α-particle and a proton travel with the same velocity in a magnetic field