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8th grade Wavelength, amplitude and frequency worksheet

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Wavelength, amplitude and frequency

Grade 8 Science Worksheet - Challenge Me

NameDate

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

  1. 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?

  2. 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?

  3. 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?

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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
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8th grade Wavelength, amplitude and frequency worksheet – printable
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About this worksheet

Wavelength, amplitude and frequency. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can label a crest and trough, and measure amplitude (rest line to crest) and wavelength (crest to crest) using a grid's scale.
  • I can find frequency as waves per second, in Hz.
  • I can say that a bigger amplitude carries more energy, and that a wave carries energy, not the water, rope or air.
  • I can use speed = frequency × wavelength. At the same speed, a higher frequency means a shorter wavelength. I can use real sound values: about 343 m/s in air and 1,481 m/s in water at 20 °C, and hearing from about 20 to 20,000 Hz.

Standard: MS-PS4-1

Words to know

crest / trough: The top / the bottom of a wave

rest line: Where the rope or water sits with no wave

amplitude: Height from the rest line to a crest

wavelength: Distance from one crest to the next crest

frequency: Waves passing each second, in hertz (Hz)

compression: A squeezed part of a slinky or sound wave

Common mistakes

Your child measured from trough to crest. Amplitude is from the flat rest line up to a crest: half that height.

Your child measured from a crest to the next trough. A wavelength is one full wave: crest to the next crest.

Your child divided the time by the count. Frequency is waves per second: the count divided by the seconds.

Questions parents ask

What is the most common mistake with wavelength, amplitude and frequency?

Your child measured from trough to crest. Amplitude is from the flat rest line up to a crest: half that height.

Are these 8th 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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