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821
Which of the following statements is true of ultra violet radiations? It
  • A. supports the sensation of hearing
  • B. does not cause the emission of electrons from metals
  • C. is an electromagnetic wave
  • D. is not capable of causing sun burns
View Answer & Discuss WAEC 2003
822
A radioactive element has a decay constant of 0.077s-1, calculate its half life
  • A. 12.5s
  • B. 9.0s
  • C. 5.1s
  • D. 0.5s
View Answer & Discuss (2) WAEC 2003
823
The minimum energy required to remove an electron from an atom is known as
  • A. excitation energy
  • B. ionization energy
  • C. binding energy
  • D. photon energy
View Answer & Discuss (3) WAEC 2003
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824

Nuclear fission is preferred to nuclear fusion in the generation of energy because?

  • A. very high temperature are required for fusion
  • B. the raw material of fusion are not easily obtained
  • C. energy obtained from fusion is relatively smaller
  • D. the by product of fusion are very dangerous
View Answer & Discuss (8) WAEC 2003
825
Which of the following reactions represents nuclear fusion?
  • A. \(^2_1H + ^2_1H \to ^3_2He + ^1_0n\)
  • B. \(^235_92U + ^1_0n \to ^145_56Ba + ^90_36Kr \)
  • C. \(^234_90TH \to ^0_-1n + ^3_2He + ^1_0Pa\)
  • D. \(^238_92U \to ^4_2H \to ^3_2He + ^234_90Th\)
View Answer & Discuss (1) WAEC 2003
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