doppler effect
9 months ago
luke_vidak_77308
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• Question 1
30 seconds
Q.

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

• Question 2
30 seconds
Q.

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

it's not possible to beat the trap.

• Question 3
120 seconds
Q. 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.
• Question 4
120 seconds
Q. 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.
• Question 5
120 seconds
Q. 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
• Question 6
120 seconds
Q. 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.
• Question 7
120 seconds
Q. 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
• Question 8
120 seconds
Q. 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)
• Question 9
120 seconds
Q. When blueshift occurs, the perceived frequency of the wave would...
Increase
Decrease
Stay the same
Make duck sounds
• Question 10
120 seconds
Q. When blueshift occurs, the perceived WAVELENGTH of the wave would...
Increase
Decrease
Stay the same
Make frog sounds
• Question 11
120 seconds
Q.

You stand on the sidewalk next to the street. A fire truck is moving towards you. The frequency of the siren on the fire truck is 600 Hz.

What should you hear?

Frequency higher than 600 Hz

Frequency lower than 600 Hz

Exactly 600 Hz

No sound, silence.

• Question 12
120 seconds
Q.

You stand on the sidewalk next to the street. A fire truck is away from you. The frequency of the siren on the fire truck is 600 Hz.

What should you hear?