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1016

Which of the transitions will produce the emission of highest frequency?

  • A. V
  • B. IV
  • C. III
  • D. II
View Answer & Discuss (2) WAEC 1999
1017
I. All elements emit and absorb characteristic spectra. II. Spectral analysis is an important method of identifying environmental pollutants. III. The chemical composition of stars could be determined using spectral analysis. Which of the statements above are correct?
  • A. I, II and III
  • B. II and III only
  • C. I and III only
  • D. I and II only
View Answer & Discuss (3) WAEC 1999
1018
A metal has work function of 4.375 eV Calculate its threshold frequency. (h = 6.6 x 10-34Js; 1eV = 1.6 x 10-19J)
  • A. 2.01 X 1015Hz
  • B. 1.06x1015Hz
  • C. 6.30 x 1014Hz
  • D. 1.60 x 1014Hz
View Answer & Discuss (8) WAEC 1999
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1019
The half-life of a radioactive substance is
  • A. its average life time
  • B. one-half the value of its decay constant.
  • C. the length of time needed by the substance to decay completely
  • D. the length of time during which the activity of the substance reduces by 50%.
View Answer & Discuss WAEC 1999
1020
The half-life of a radioactive element is 5 Calculate its decay constant
  • A. 0.113s-1
  • B. 0.436 s-1
  • C. 0.139 s-1
  • D. 0.193 s-1.
View Answer & Discuss (9) WAEC 1999
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