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2716
The main difference between echo and reverberation is that
  • A. reverberation is reflected sound while echo is refracted sound
  • B. the time interval between incident sound and reflecte sound is shorter for reverbration
  • C. the amplitude of an echo is greater
  • D. reverberation is from acoustic speakers while echo comes from clifts
View Answer & Discuss WAEC 2011
2717

Which of the following statements about the electromagnetic waves is correct?

  • A. radio waves have longer frequencies than x-rays
  • B. x-rays have the longest wavelength
  • C. some of the waves travel at 3.0 x 108ms-1
  • D. white light occupies a region beyond ultraviolet rays
View Answer & Discuss (13) WAEC 2011
2718
The correct relationship between "G" and "g" in a gravitational field is given by the equation (Where the symbols have their usual meanings)
  • A. g = \(\frac{GM}{R}\)
  • B. g = \(\frac{GM}{R^2}\)
  • C. g = \(\frac{GM^2}{R}\)
  • D. g = \(\frac{GM^2}{R^2}\)
View Answer & Discuss WAEC 2011
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2719
The capacitance of a parallel-plate capacitor
  • A. decreases when the seperation between the plate decreases
  • B. increases when the optential difference between the plates is increased
  • C. is greater without a dielectric material between the plates than with a dielectric
  • D. is greater with a dielectric between the plates than without a dielectric.
View Answer & Discuss (2) WAEC 2011
2720

When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold

  • A. collapse slowly
  • B. vibrate
  • C. are not affected
  • D. diverge rapidly
View Answer & Discuss (5) WAEC 2011
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