Question

Match the major interstellar gas type with the method used for observing that type. neutral hydrogen gas giant molecular clouds ionized hydrogen gas ultra-hot interstellar gas

A. Radio and infrared spectral lines.
B. Ultra-violet and x-ray emissions.
C. Optical emissions, especially the Balmer lines.
D. 21-cm wavelength emissions from electron spin-flip.

Answer 1

Neutral Hydrogen gas -- 21-cm wavelength emissions from electron spin-flip.

Giant molecular clouds --- Radio and infrared spectral lines.

Ionized hydrogen gas --- Optical emissions, especially the Balmer lines

Ultra-hot interstellar gas --- Ultra-violet and x-ray emissions

Step-by-step explanation:

TYPE OF INTERSTELLAR METHOD USED

GAS TYPE

Neutral Hydrogen gas -- 21 centimeter wavelength emission through electron spin-flip.

Giant molecular clouds --- Radio & infrared spectral lines.

Ionized hydrogen gas --- Optical emissions, especially the Balmer lines

Ultra-hot interstellar gas --- Ultraviolet & x-ray emissions