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1021
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
1022
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
1023

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
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1024
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
1025
If the air inside a rigid box is heated, the i, average speed of the molecules increases ii. pressure of the air increases iii. average separation of the molecule increases. Which of the statements above are correct?
  • A. i and ii only
  • B. ii and iii only
  • C. i and iii only
  • D. i, ii and iii
View Answer & Discuss (6) WAEC 2008
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