WAEC - Physics (1998 - No. 51)
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?
I. Certain wavelengths are absorbed.
II. an emission line spectrum results.
III. A dark line is left.
Which of the following is/are correct?
i only
iii only
i and ii only
i and iii only
ii and iii only
Spiegazione
When light from a source is sent through a gas some light of certain wavelengths is absorbed resulting in gaps that appear as dark lines