The Doppler Effect and Universe Expansion

Front

What does Hubble's law state?

Back

The further away a galaxy is, the faster it is receding.

Front

Can light change color due to the Doppler Effect?

Back

True

Front

What happens to the pitch of a siren as a police car passes by?

Back

It decreases.

Front

If a star's light is blue shifted, what does it indicate?

Back

The star is moving towards the observer.

Front

If a star is moving away from us, how will its spectral lines appear?

Back

Red shifted.

Front

What is the Doppler Effect?

Back

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

Front

What is redshift?

Back

The phenomenon where light from an object moving away from the observer shifts to longer wavelengths.

Front

What is blueshift?

Back

The phenomenon where light from an object moving towards the observer shifts to shorter wavelengths.

Front

How does the Doppler Effect apply to sound?

Back

The pitch of a sound increases as the source approaches and decreases as it recedes.

Front

What is the significance of Hubble's observations?

Back

They provided evidence for the expanding universe.