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851

A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclide will remain after 80 hours?

  • A. 1/32
  • B. \(\frac{1}{16}\)
  • C. \(\frac{1}{8}\)
  • D. \(\frac{1}{4}\)
  • E. \(\frac{1}{2}\)
View Answer & Discuss (14) WAEC 1993
852

Which of the following is used a nuclear reactor to slow down fast moving neutrons?

  • A. Carbondioxide gas
  • B. Liquid sodium metal
  • C. Concrete shield
  • D. Graphite rods
  • E. Boron rods
View Answer & Discuss (6) WAEC 1993
853
According to the kinetic theory of gases the collision
of the molecules of a gas with the wall of the container
is mainly responsible for the l. temperature of the
gas ll. viscosity of the gas Ill. pressure of the gas
Which of the statements above is/are correct?
  • A. I only
  • B. II only
  • C. III only
  • D. II and III only
  • E. I, II and III.
View Answer & Discuss (3) WAEC 1993
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854
Eight or - particles and size B - particles are emitted from an atom of 92238U before it achieves stability. What is the nucleon number of the final product in the chain reaction?
  • A. 206
  • B. 234
  • C. 238
  • D. 240
  • E. 252
View Answer & Discuss (5) WAEC 1993
855
When an atom is in the ground state, it is said to be
  • A. grounded
  • B. excited
  • C. stable
  • D. ionized
  • E. radiating
View Answer & Discuss WAEC 1993
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