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Physics 2009 JAMB Past Questions

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31

If the decay constant of a radioactive substance is 0.231s-\(^1\), the half-life is?

  • A. 3.00 s
  • B. 0.12 s
  • C. 0.33 s
  • D. 1.50 s
View Answer & Discuss (4) JAMB 2009
32

A piece of radioactive material contains 10\(^{20}\) atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is?

  • A. 3.47 x 1018
  • B. 6.93 x 10 20
  • C. 3.47 x 1020
  • D. 6.93 x 1018
View Answer & Discuss (4) JAMB 2009
33

Thermionic emission is the process whereby?

  • A. β - rays are produced
  • B. holes are produced
  • C. x - rays are produced
  • D. electrons leave a hot element
View Answer & Discuss JAMB 2009
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34

Which of the following can conduct electricity owing to the presence of free mobile electrons?

  • A. germanium
  • B. silicon
  • C. grapefruit
  • D. copper
View Answer & Discuss JAMB 2009
35

When a pentavalent impurity is added to a pure semiconductor, it becomes?

  • A. a p-type semiconductor
  • B. an n-type semiconductor
  • C. an insulator
  • D. an intrinsic semi-conductor
View Answer & Discuss (1) JAMB 2009
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