doppler effect and red shift

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

Use the image to identify the motion of the object relative to Earth.  Compare the absorption spectra of the star to what the star would look like if it were not moving at all relative to Earth.

• It is not moving
• It is moving away from Earth (Redshift)
• It is moving towards Earth (Blueshift)
• It is moving towards Earth (Redshift)

When a car coming toward you, the honk getting_________

• higher
• lower

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

In a pitch-black night, you hear a police siren is getting higher and higher, could you tell if the car is coming toward you or driving away from you?

• coming toward you
• away from you
• going circles around you
• parking still

When a car moves towards you, the sound of its horn seems relatively...

• Low pitched
• High pitched
• Normal

What direction is this object moving?

• left
• right
• up
• down