Question

Interstellar space (the space between the stars) is filled with extremely low-density hydrogen gas. In the vicinity of a hot star, this gas can be heated to a very high temperature. This hot, low-density gas will:
a.emit light at all wavelengths, in a blackbody spectrum characteristic of a hot gas.

b.reflect light at specific wavelengths characteristic of hydrogen.

c.emit light at specific wavelengths characteristic of hydrogen.

d.emit light at all wavelengths.

Answer 1

Answer:

c. emit light at specific wavelengths characteristic of hydrogen.

Explanation:

The heated hydrogen gas with extremely low density will emit light with specific characteristics of hydrogen wavelengths.

This is because when the gas has a very low density it tends to emit rays of light of a certain frequency. When this gas is close to a star, as shown in the question above, the star promotes a continuous beam of light that accesses the hydrogen gas that absorbs all that energy. In this case, the gas acts as a light source and begins to emit light with specific wavelength characteristics.