doppler effect
9 months ago
luke_vidak_77308
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12 QuestionsShow answers
  • 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

    answer choices

    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

    answer choices

    the same frequency as received.

    a higher frequency than received.

    a lower frequency than received.

    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...
    answer choices
    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?
    answer choices
    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.
    answer choices
    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...
    answer choices
    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.
    answer choices
    More Redshift
    More Blueshift
    Less Redshift
    Less Blueshift
  • Question 8
    120 seconds
    Q. Which discovery(ies) came from our understanding redshift/ blueshift?
    answer choices
    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...
    answer choices
    Increase
    Decrease
    Stay the same
    Make duck sounds
  • Question 10
    120 seconds
    Q. When blueshift occurs, the perceived WAVELENGTH of the wave would...
    answer choices
    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?

    answer choices

    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?

    answer choices

    A higher pitch of sound.

    A lower pitch of sound.

    A changing sound (up and down)

    No sound, silence.

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