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61
What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?
  • A. Compound microscope
  • B. Galileo's telescope
  • C. Terrestrial telescope
  • D. Astronomical telescope
View Answer & Discuss (6) JAMB 2000
62
in a pure semiconductor, the number of electrons in the conduction band is
  • A. less than the number of holes in the valence band
  • B. equal to the number of holes in the valence band
  • C. greater than the number of holes in the valence band
  • D. twice the number of holes in the valence band
View Answer & Discuss (4) JAMB 2000
63

In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]

  • A. 9.0 x 10-13J
  • B. 9.0 x 10-12J
  • C. 9.0 x 10-11J
  • D. 9.0 x 10-10J
View Answer & Discuss (11) JAMB 2000
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64
A gas would serve as an electrical conductor under
  • A. reduced pressure and high current
  • B. increased magnetic field
  • C. reduced pressure and reduced potential
  • D. exposure to visible light
View Answer & Discuss (4) JAMB 2000
65
If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Pa is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
  • A. ∆x ∆Px ≥ h
  • B. ∆x ∆Px = 0
  • C. ∆x ∆Px < h
  • D. ∆x ∆Px = ∞
View Answer & Discuss JAMB 1999
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