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Physics 1989 JAMB Past Questions

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31

When a radiation strikes a metal surface, electrons may be ejected from the metal. The maximum kinetic energy which may be acquired by an ejected electron depend on the

  • A. intensity of the radiation
  • B. source of the radiation
  • C. wavelength of the radiation
  • D. detection device of the electron
View Answer & Discuss (14) JAMB 1989
32

Which of the following is TRUE of the particles emitted in radioactive disintegration?

  • A. the beta particle is the helium nucleus H
  • B. the alpha particle is lighter than the beta particle
  • C. the alpha particle is deflected more than the beta particle in a magnetic field
  • D. the beta particle is deflected more than the alpha particle in a magnetic field
View Answer & Discuss (10) JAMB 1989
33
Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of
  • A. 70
  • B. 78
  • C. 82
  • D. 90
View Answer & Discuss (2) JAMB 1989
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34

An object is placed at 5.6 x 10\(^{-4}\)m in front of a converging lens of focal length 1.0 x 10\(^{-n}\)m. The image formed is

  • A. Real, Erect and magnified
  • B. Virtual, erect and magnified
  • C. Real, inverted and magnified
  • D. Virtual, erect and diminished
View Answer & Discuss (26) JAMB 1989
35
The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the
  • A. Temperature of the refrigerator low and constant
  • B. keep current supplied to the refrigerator below 5A
  • C. Voltage supply constant
  • D. Current supplies to the refrigeration
View Answer & Discuss (3) JAMB 1989
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