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4611

The periodic rise and fall in the intensity of sound produced whn two notes of nearly equal frequencies are sounded together is called?

  • A. doppler effect
  • B. beat
  • C. interference
  • D. resonance
View Answer & Discuss (2) WAEC 2022
4612

The power of the lens is +2.5D. What is the radius of the curvature?

  • A. 2.5 cm
  • B. 25.0 cm
  • C. 40.0 cm
  • D. 80.0 cm
View Answer & Discuss WAEC 2022
4613

The reason for having a large number of turns in the coil of a moving coil galvanometer is to--------

  • A. make the deflection of the needle proportional to the current
  • B. increase the sensitivity of the galvanometer
  • C. decrease the magnetic flux produced by the magnet
  • D. make the permanent magnet stronger
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4614

 Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will------------------

  • A. move in a circle
  • B. repel each other
  • C. remain stationary
  • D. attract each other
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4615

The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--

  • A. 3.0 x 10\(^{-5}\)s
  • B. 1.0 x 10\(^{-4}\) s
  • C. 1.0 x 10\(^{4}\)s
  • D. 3.0 x 10\(^{4}\)s
View Answer & Discuss WAEC 2022
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