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546
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
547
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
548

During the nuclear reaction described by

\(^{235}_{92}\)W → \(^{235}_{93}\)X → \(^{231}_{91}\)Y

The particles emitted are respectively

 

  • A. α and α
  • B. α and β
  • C. β and β
  • D. β and α
View Answer & Discuss (11) JAMB 2007
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
549
from the diagram above, the inductive reactance and the resistance R are respectively
  • A. 50Ω and 45Ω
  • B. 25Ω and 51Ω
  • C. 20Ω and 50Ω
  • D. 10Ω and 50Ω
View Answer & Discuss (1) JAMB 2007
550

118.8cm2 surface of the copper cathode of a voltameter is to be coated with 10-6m thick copper of density 9 x 103kgm-3. How long will the process run with 10A constant current?
[3.3 x 10-7kgC-1]

  • A. 5.4 min
  • B. 10.8 min
  • C. 15.0 min
  • D. 20.0 min
View Answer & Discuss (16) JAMB 2007
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