A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains
A) gas at the same temperature as the other jar.
B) the cooler gas.
C) gas at very high pressure.
D) the hotter gas.
E) the exact same gas as the other jar.

Question

Quizplus · Accepted Answer

The dark spectral lines, known as absorption lines, occur when cooler gas in the foreground absorbs specific wavelengths of light emitted by the hotter gas behind it.

A Jar Filled with Gas Is Placed Directly in Front