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2776
An atom in an excited state is one whose
  • A. potential energy is minimum
  • B. potential energy is maximum
  • C. electron are in the conduction band
  • D. electron have moved to higher energy level
View Answer & Discuss WAEC 2012
2777
A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is
  • A. 1.0eV
  • B. 3.0eV
  • C. 4.0eV
  • D. 7.0eV
View Answer & Discuss (1) WAEC 2012
2778
Which of the following statements about X-rays is correct? X-rays
  • A. are produced when a metal surface is irradiated with ultraviolet light
  • B. are produced when a metal target is used to block fast miving electrons
  • C. have long wavelengths and are therefoer very penetrating
  • D. are not part of the electromagnetic spectrum
View Answer & Discuss (1) WAEC 2012
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2779

Which of the following arrangements of radiations is in the order of decreasing penetrating power?

  • A. \(\alpha, \beta, \gamma\)
  • B. \(\alpha, \gamma, \beta\)
  • C. \(\gamma, \beta, \alpha\)
  • D. \(\beta, \gamma, \alpha\)
View Answer & Discuss (5) WAEC 2012
2780

Which of the following radiations emitted in radioactive decay has momentum, a fairly high penetrating power and is deflected by a magnet?

  • A. alpha particles
  • B. beta particle
  • C. gamma radiation `
  • D. X-radiation
View Answer & Discuss (6) WAEC 2012
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