Doppler Effect and Red Shift

Front

What is the Doppler Effect?

Back

The Doppler Effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

Front

How does the Doppler Effect relate to sound?

Back

When a sound source moves towards an observer, the sound waves compress, leading to a higher pitch. When it moves away, the waves stretch, resulting in a lower pitch.

Front

What happens to the frequency of light from a star moving away from Earth?

Back

The frequency decreases, causing the light to shift towards the red end of the spectrum, known as redshift.

Front

What is redshift?

Back

Redshift is the phenomenon where light from an object is shifted to longer wavelengths (redder) as the object moves away from the observer.

Front

What is blueshift?

Back

Blueshift is the opposite of redshift; it occurs when light from an object is shifted to shorter wavelengths (bluer) as the object moves towards the observer.

Front

What does a redshift indicate about a star's movement?

Back

A redshift indicates that the star is moving away from the Earth.

Front

What does a blueshift indicate about a star's movement?

Back

A blueshift indicates that the star is moving towards the Earth.

Front

How does the Doppler Effect apply to galaxies?

Back

The Doppler Effect shows that most galaxies are moving away from us, which is evidenced by their redshift.

Front

What is the significance of the redshift of distant galaxies?

Back

The redshift of distant galaxies supports the Big Bang theory, indicating that the universe is expanding.

Front

What happens to the wavelength of light when an object moves away from an observer?

Back

The wavelength increases (gets longer) when an object moves away from an observer.