Stars & The Universe

What best describes the doppler effect?

• An apparent change in frequency of a wave due to the relative motion between a wave source and an observer
• When sound changes pitch
• When light changes color
• An apparent change in the amplitude of a wave due to the relative motion between a wave source and an observer.

If a star is being observed from Earth and it's light has shifted towards the blue side of the electromagnetic spectrum it would be...

• Moving towards the Earth
• Moving away from the Earth
• This is a trick question that cannot be answered
• It isn't a star, it is a very large blueberry.

If a star is being observed from Earth and it's light has shifted towards the red side of the electromagnetic spectrum it would be...

• Moving towards the Earth
• Moving away from the Earth
• This is a trick question that cannot be answered
• It isn't a star, it is a very large blueberry.

The vast majority of galaxies in our universe are moving away from us.  We know this because we observe __________ in the galaxies absorption spectra.

• Redshift
• Blueshift
• Turbulance
• Superposition

When someone is playing music by the road and you drive pass him, the music will _______

• become higher and then lower
• become lower and then higher
• become lower
• become higher

Why is the light from distant galaxies red-shifted?

• They produce more red light than nearby galaxies
• They are moving away from us
• The longer wavelengths are filtered out more by dust
• They are moving toward us

In red shift, the wavelengths of light become

• Bluer
• shorter
• longer

Are any of the galaxies moving towards Earth?  Explain.

• A.  It is redshifted
• B. It is redshifted.
• C. It is blue shifted.
• A. It is blueshifted.

Based on  Doppler effect, which of the galaxies is moving away from Earth?

• A
• B 
• C
• A and B

Evidence suggests that the whole Universe is expanding and that it might have started billions of years ago from one place with the big bang.

• True
• False