IS - Mod 2 - Redshift

What is the primary use of the term 'redshift' by astronomers?

• To determine the temperature of stars.

• To describe how far away objects are.

• To measure the brightness of celestial bodies.

• To identify the chemical composition of planets.

When a police car with its siren on is moving, how are the sound waves affected?

• Waves are stretched in front and compressed behind.

• Waves are compressed in front and stretched behind.

• Waves are compressed equally in all directions.

• Waves are stretched equally in all directions.

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What happens to light waves when an object in space moves towards an observer?

• The light waves are stretched, resulting in a redshift.

• The light waves are compressed, resulting in a blueshift.

• The light waves remain unchanged, but their intensity increases.

• The light waves are absorbed, making the object appear darker.

Why is the light from the most distant objects in our universe observed to be redshifted?

• Because the universe is contracting.

• Because the light waves lose energy over vast distances.

• Because the universe is expanding.

• Because distant objects are moving towards us.