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11th grade The Doppler effect worksheet

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Level: Building Confidence · On Level · Challenge Me

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The Doppler effect

Grade 11 Science Worksheet - Challenge Me

NameDate

Circle the best answer, or write your answer on the line.

  1. A 600 Hz buzzer on a model train moves away at 10 m/s. With sound at 343.3 m/s in 20 °C air, what frequency does a listener behind it hear, to the nearest tenth, Bo?

  2. A 250 Hz train horn moves away at 40 m/s. With sound at 343.3 m/s in 20 °C air, what frequency does a listener behind it hear, to the nearest tenth, Esme?

  3. Two identical horns pass a listener. Horn X shifts by 10 Hz and horn Y by 30 Hz. Which is moving faster, Kira?

    • Horn Y
    • Horn X
    • They move at the same speed

  4. Which change would make a passing horn's Doppler shift bigger, Luz?

    • A faster train
    • A longer train
    • A louder horn

  5. Milo says a train's horn really changes its note as it passes a platform. Agree or disagree?

    • Agree: the driver changes the horn's note as it passes
    • Disagree: the note heard changes, not the horn's
    • Agree: the horn gets tired and drops

  6. Noah says a toy buzzer makes a higher note while it moves toward you. Agree or disagree?

    • Agree: moving toward you makes the buzzer buzz faster
    • Agree: buzzers change note when they move
    • Disagree: it makes the same note; you hear it higher

  7. Pia says the Doppler effect is the horn getting louder as it comes near. Agree or disagree?

    • Agree: loudness and pitch are the same
    • Agree: nearer sounds are louder, and that is the effect
    • Disagree: it is a change in pitch

  8. How can a weather radar use the Doppler effect, Ren?

    • To measure how heavy the clouds are
    • To make the rain fall faster
    • To measure how fast rain and wind move

  9. A radar speed sensor at a baseball game sends radio waves at a pitched ball. What can the shifted echoes show, Tala?

    • The color of the ball
    • How fast the ball is moving
    • How heavy the ball is

  10. What do astronomers learn from the redshift of distant galaxies, Zee?

    • They are made of red rock
    • They are getting hotter
    • They are moving away from us
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11th grade The Doppler effect worksheet – printable
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About this worksheet

The Doppler effect. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can explain the Doppler effect from bunched and spread wave fronts. An approaching source sounds higher, one moving away sounds lower, and the pitch drops as it passes.
  • I can tell the source's own frequency, which never changes, from the frequency heard. I can tell pitch from loudness.
  • I can use f = f₀v ÷ (v − vₛ) for an approaching source and f₀v ÷ (v + vₛ) for one moving away, with sound at 343.3 m/s in 20 °C air. I know a moving listener also hears a shift.
  • I can read redshift (moving away) and blueshift (approaching) in light, and name uses: weather radar, radar speed sensors and astronomy.

Standard: none (TX, FL)

Words to know

Doppler effect: A change in the frequency heard because the source or listener moves

source: The object making the waves, like a horn

redshift: Light stretched to longer wavelengths because its source moves away

blueshift: Light squeezed to shorter wavelengths because its source approaches

pitch: How high or low a sound is; set by frequency

Common mistakes

Your child added the frequencies. The shift is the heard frequency minus the source's frequency.

Your child used the wrong sign. An approaching source bunches the waves, so use v − vₛ; a source moving away spreads them, so use v + vₛ.

Your child thought the source itself changes pitch. The source keeps its frequency; the listener hears a shifted one because of the motion.

Questions parents ask

What is the most common mistake with the doppler effect?

Your child added the frequencies. The shift is the heard frequency minus the source's frequency.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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