What is opacity?
A)the balance between the pressure and force of gravity inside a star
B)the force that binds protons and neutrons together to form a nucleus
C)the temperature and density at which a gas will undergo thermonuclear fusion
D)a measure of the resistance to the flow of radiation (photons) through a gas

Question

Quizplus · Accepted Answer

Opacity refers to the ability of a material to absorb and scatter photons (radiation) passing through it. In astronomy, opacity is an important consideration when studying how radiation interacts with matter, particularly in stars and interstellar gas clouds.

What Is Opacity