The Doppler effect
Grade 11 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
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?
A listener hears a buzzer at 1020 Hz. The buzzer makes 1000 Hz. What is it doing, Jun?
- Moving toward the listener
- Standing still
- Moving away from the listener
Two identical horns pass a listener. Horn X shifts by 10 Hz and horn Y by 30 Hz. Which is moving faster, Kira?
- They move at the same speed
- Horn X
- Horn Y
Which change would make a passing horn's Doppler shift bigger, Luz?
- A longer train
- A louder horn
- A faster train
Milo says a train's horn really changes its note as it passes a platform. Agree or disagree?
- Agree: the horn gets tired and drops
- Agree: the driver changes the horn's note as it passes
- Disagree: the note heard changes, not the horn's
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
Pia says the Doppler effect is the horn getting louder as it comes near. Agree or disagree?
- Agree: nearer sounds are louder, and that is the effect
- Agree: loudness and pitch are the same
- Disagree: it is a change in pitch
How can a weather radar use the Doppler effect, Ren?
- To measure how fast rain and wind move
- To make the rain fall faster
- To measure how heavy the clouds are
A radar speed sensor at a baseball game sends radio waves at a pitched ball. What can the shifted echoes show, Tala?
- How fast the ball is moving
- How heavy the ball is
- The color of the ball
What do astronomers learn from the redshift of distant galaxies, Zee?
- They are moving away from us
- They are made of red rock
- They are getting hotter