The type II tail of a comet shows a spectrum of absorption lines on a bright background (like the Sun's spectrum).From this,one can conclude that the tail contains
A) dust.
B) thin gas.
C) no atoms at all,just empty space.
D) the spectrum does not tell which of the above is true.

Question

Quizplus · Accepted Answer

The absorption lines on a bright background indicate the presence of dust, as dust can scatter sunlight and produce such a spectrum.

The Type II Tail of a Comet Shows a Spectrum