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2146
An electron is accelerated from rest through a potential difference of 70kV in a vacuum. Calculate the maximum speed acquired by the electron (electronic charge = -1.6 x 10-19; mass of an electron = 9.1 x 10-31kg)
  • A. 3.00 x 108ms-1
  • B. 2.46 x 108ms-1
  • C. 1.57 x 108ms-1
  • D. 1.32 x 108ms-1
  • E. 1.11 x 108ms-1
View Answer & Discuss (3) WAEC 1998
2147

When light from a source is sent through a gas
I. Certain wavelengths are absorbed.
II. an emission line spectrum results.
III. A dark line is left.
Which of the following is/are correct?

  • A. i only
  • B. iii only
  • C. i and ii only
  • D. i and iii only
  • E. ii and iii only
View Answer & Discuss (2) WAEC 1998
2148
The diagram above represents a section of a pair of vernier calipers. The reading on the instrument is
  • A. 5.22cm
  • B. 5.24cm
  • C. 5.26
  • D. 5.35
View Answer & Discuss (4) WAEC 1998
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2149
The process of increasing the energy of an atom via inelastic collision with an electron is known as
  • A. ionization
  • B. excitation
  • C. field emission
  • D. photoemission
  • E. thermonic emission
View Answer & Discuss WAEC 1998
2150

A radioactive nuclide of proton number X emits a \(\beta\)-particle to form a new nuclide to proton number Y. The correct equation relating X and Y is

  • A. X = Y - 1
  • B. X = Y + 1
  • C. X = 1 - Y
  • D. X = \(\frac{1}{y}\)
  • E. X = Y
View Answer & Discuss (17) WAEC 1998
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