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2726
Which of the following practices will lead to losses in electrical power transmission?
  • A. using transmission cables of large diameter
  • B. transmitting at high voltage and low current
  • C. transmitting at relatively low voltage and high current
  • D. using a set-up transformer at the production end
View Answer & Discuss WAEC 2011
2727
For photoelectric emission, the threshold frequency is the
  • A. maximum frequency of incident radiation that will eject elecrons
  • B. minimum fraquency of incident radiation required to eject elecrons
  • C. frequency which results in the emission of the greater number of electrons
  • D. fraquency whch impacts greatest kinetic energy to emitte electrons
View Answer & Discuss (3) WAEC 2011
2728
Which of the following properties is not applicable to X-rays? They
  • A. travel in straight lines
  • B. travel with the speed of light
  • C. are deflected by magnetic field
  • D. affect photographic films
View Answer & Discuss (4) WAEC 2011
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2729
Uranium-234 disintegrated to form Thorium-230 by emitting
  • A. alpha particles
  • B. gamma rays
  • C. beta negative rays
  • D. beta positive rays
View Answer & Discuss WAEC 2011
2730
The change in mass of fuel during a nuclear reaction is 2.0 x 10-27 kg. Calculate the amount of energy released. (Speed of light = 2.0 x 108ms-1)
  • A. 1.8 x 10-10J
  • B. 9.0 x 10-11J
  • C. 6.0 x 10-19J
  • D. 1.2 x 10-45J
View Answer & Discuss (6) WAEC 2011
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