Wavelength, amplitude and frequency
Grade 8 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Sound travels about 343 m/s in air at 20 °C. A speaker plays a 343 Hz note. What is the note's wavelength in air, Ari?
Sound travels about 343 m/s in air at 20 °C. A speaker plays a 686 Hz note. What is the note's wavelength in air, Bo?
Sound travels about 343 m/s in air at 20 °C. A speaker plays a 245 Hz note. What is the note's wavelength in air, Esme?
In the wave graph, which wave carries more energy, Jun?
- Wave Q, with the bigger amplitude
- Wave P, since it is faster
- Both the same, since they share a rope
- Wave P, with the longer wavelength
In the wave graph, which wave has the higher frequency, Kira?
Use the picture in question 4.
- Neither has a frequency
- Wave P, with the longer wavelength
- Both the same, since they share a rope
- Wave Q, with the shorter wavelength
Milo says pond ripples carry the pond's water to the edge. Agree or disagree?
- Agree: amplitude is crest to trough
- Agree: the water rides along with each ripple
- Agree: bigger ripples move faster
- Disagree: they carry energy, not the water
Noah says a wave's amplitude is its height from trough to crest. Agree or disagree?
- Disagree: it is rest line to crest
- Agree: taller waves travel faster
- Agree: and shorter waves have lower frequency
- Agree: amplitude is the full height
People hear sounds from about 20 Hz to 20,000 Hz. A dog whistle plays at 25,000 Hz. Can Ren hear it?
- Yes, if it is loud enough
- No; it is above 20,000 Hz
- Yes; dogs and people hear the same sounds
- Yes; 25,000 is close to 20,000
At 20 °C, sound travels about 343 m/s in air and about 1,481 m/s in water. Where does it travel faster, Tala?
- The same in both
- Sound can't travel in water
- In air, since air is thinner
- In water
Sound travels about 343 m/s in air. Zee claps while facing a cliff 343 m away. About how long until the echo comes back?
- About 2 s
- About 343 s
- About 0 s, since sound is instant
- About 1 s