doppler effect

A star orbits another much heavier one in an elliptical orbit as shown below.

The light received from the star at Earth will be alternately shifted to the red and blue, which of the following statements is true

• The blue shift will be more than the red shift

• The red shift will be more than the blue shift.

• The red shift will be the same as the blue shift

• The time red shifted is shorter than the time blue shifted

A police speed trap calculates the speed of a car by using the Doppler shift produced when an electromagnetic wave is reflected off a moving car. To beat the trap the car could send a different frequency wave back to the policeman, the wave should be

• the same frequency as received.

• a higher frequency than received.

• a lower frequency than received.

• it's not possible to beat the trap.

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.

Tags

NGSS.HS-ESS1-2

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.

Tags

NGSS.HS-PS4-1

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

Tags

NGSS.HS-ESS1-2

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.

Tags

NGSS.HS-ESS1-2

An object that is moving VERY fast away from Earth would have ________ than an object that is moving very slow away from Earth.

• More Redshift
• More Blueshift
• Less Redshift
• Less Blueshift

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-3

Which discovery(ies) came from our understanding redshift/ blueshift?

• The universe is expanding
• Most galaxies are moving away from us
• Andromeda galaxy will collide with the Milky way in 3.75 billion years
• All of the above (and many more)

Tags

NGSS.HS-ESS1-2

When blueshift occurs, the perceived frequency of the wave would...

• Increase
• Decrease
• Stay the same
• Make duck sounds

Tags

NGSS.HS-PS4-1

When blueshift occurs, the perceived WAVELENGTH of the wave would...

• Increase
• Decrease
• Stay the same
• Make frog sounds

Tags

NGSS.HS-PS4-1