Physics 1998 WAEC Past Questions

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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

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

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

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