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  1. The velocity of radio-waves is 3×10⁵ km/s. The frequency corresponding to wavelength
  2. An alternating voltage of 220 V, 50 Hz frequency is applied across a capacitor
  3. A thermoelectric refrigerator works on
  4. Two capacitors having capacitances C₁ and C₂ are charged with 120V and 200V batteries
  5. An object moving with a speed of 6.25 m/s, is deaccelerated at a rate given by