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Physics WAEC Past Questions

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421
A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm-1 Calculate the work done on the charge
  • A. 5.0 x 106J
  • B. 1.0 x10-6J
  • C. 5.0 x10-7J
  • D. 1.0 x 10-2J
View Answer & Discuss (9) WAEC 1999
422
Bohr’s atomic model proves most successful for the explanation of the. I. structure of the hydrogen atom; II. line spectra of the hydrogen atom; III. Multi-electron atoms. Which of the statements above is/are correct?
  • A. I only
  • B. II only
  • C. I and II only
  • D. I and III only
View Answer & Discuss WAEC 1999
423

The diagram above illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of longest wavelength?

  • A. I
  • B. II
  • C. III
  • D. IV
View Answer & Discuss (4) WAEC 1999
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424

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
425
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
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