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2536
If a gas is excited by high voltage to produce a discharge and the light is examined in a spectrometer
  • A. an explosion is observed
  • B. the rainbow colours are seen
  • C. an emission spectrum is observed
  • D. dark lines are observed
View Answer & Discuss (3) WAEC 2007
2537
The number of protons in an element increased by one after a radioactive decay. The element must have decay by emitting
  • A. a beta particle
  • B. an alpha particle
  • C. a gamma ray
  • D. a neutron
View Answer & Discuss (1) WAEC 2007
2538
In a nuclear reactor, chain reactions result from the release of
  • A. electrons
  • B. photons
  • C. neutrons
  • D. protons
View Answer & Discuss (1) WAEC 2007
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2539

The correct sequence of energy transformation in the operation of an x-ray tube is i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the emitted electrons

  • A. iv, iii, ii, i
  • B. ii, iv, iii, i
  • C. iv, ii, iii, i
  • D. iii, iv, ii, i
View Answer & Discuss (2) WAEC 2007
2540
There is always an uncertainty involved in any attempt to measure the position and momentum of an electron simultaneously. This statement is known as the
  • A. de Broglie's law
  • B. Heisenberg uncertainty principle
  • C. Franck-Hertz experimental law
  • D. wave-particle paradox
View Answer & Discuss WAEC 2007
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