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- 1. Multiple Choice
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
- 2. Multiple Choice
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.
- 3. Multiple ChoiceIf 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 EarthMoving away from the EarthThis is a trick question that cannot be answeredIt isn't a star, it is a very large blueberry.
- 4. Multiple ChoiceWhat best describes the doppler effect?An apparent change in frequency of a wave due to the relative motion between a wave source and an observerWhen sound changes pitchWhen light changes colorAn apparent change in the amplitude of a wave due to the relative motion between a wave source and an observer.
- 5. Multiple ChoiceThe vast majority of galaxies in our universe are moving away from us. We know this because we observe __________ in the galaxies absorption spectra.RedshiftBlueshiftTurbulanceSuperposition
- 6. Multiple ChoiceIf 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 EarthMoving away from the EarthThis is a trick question that cannot be answeredIt isn't a star, it is a very large blueberry.
- 7. Multiple ChoiceAn object that is moving VERY fast away from Earth would have ________ than an object that is moving very slow away from Earth.More RedshiftMore BlueshiftLess RedshiftLess Blueshift
- 8. Multiple ChoiceWhich discovery(ies) came from our understanding redshift/ blueshift?The universe is expandingMost galaxies are moving away from usAndromeda galaxy will collide with the Milky way in 3.75 billion yearsAll of the above (and many more)
- 9. Multiple ChoiceWhen blueshift occurs, the perceived frequency of the wave would...IncreaseDecreaseStay the sameMake duck sounds
- 10. Multiple ChoiceWhen blueshift occurs, the perceived WAVELENGTH of the wave would...IncreaseDecreaseStay the sameMake frog sounds
- 11. Multiple Choice
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.
- 12. Multiple Choice
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?
A higher pitch of sound.
A lower pitch of sound.
A changing sound (up and down)
No sound, silence.
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