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Physics 2011 JAMB Past Questions

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36

A radioactive isotope has a decay constant of 10-5s4. Calculate half life

  • A. 6.93 x 10-5s
  • B. 6.93 x 105s
  • C. 6.93 x104s
  • D. 6.93 x 10-4s
View Answer & Discuss (12) JAMB 2011
37
The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as
  • A. saturation
  • B. bonding
  • C. amplification
  • D. dopping
View Answer & Discuss (2) JAMB 2011
38
If the threshold frequency for tungsten is 1.3 x 1015Hz, what is its work function?


[H = 6.6 x 10-34 Js]
  • A. 8.58 x 10-19 J
  • B. 8.50 x 10-15 J
  • C. 8.58 x 10-17 J
  • D. 8.85 x 10-18
View Answer & Discuss JAMB 2011
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39
Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?
  • A. X is the anode and very high current is used
  • B. X is the anode and Y is the cathode
  • C. Y is the cathode and X is the anode
  • D. Y is the anode and very high current is used
View Answer & Discuss (2) JAMB 2011
40
The diagram above shows two vectors at right angles to each other. The value of the resultant vector is
  • A. 14.0 N
  • B. 10.0 N
  • C. 12.0 N
  • D. 13.0 N
View Answer & Discuss (4) JAMB 2011
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