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8th grade Wavelength, amplitude and frequency worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Wavelength, amplitude and frequency

Grade 8 Science Worksheet - Building Confidence

NameDate

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

  1. A rope wave's crest is 3 squares above the rest line on a grid. Each square stands for 10 cm. What is the amplitude, Ari?

  2. A water ripple's crest is 2 squares above the rest line on a grid. Each square stands for 5 cm. What is the amplitude, Bo?

  4. In the wave graph, what is the amplitude, Kira?

    • 80 cm
    • 30 cm
    • 60 cm

  5. In the wave graph, which arrow shows the amplitude, Luz?

    Use the picture in question 3.

    • An arrow from a crest down to a trough
    • C
    • D

  6. A rubber duck floats on a pond as ripples pass under it. What does the duck do, Milo?

    • Bobs up and down in about the same spot
    • Rides the ripples to the far edge
    • Sinks under each crest

  7. Noah ties a ribbon to the middle of a rope and sends a wave along it. What does the ribbon do?

    • Moves up and down, then is back where it was
    • Travels to the far end of the rope
    • Stays still the whole time

  8. Sound travels from a drum to Pia's ears. What travels across the room?

    • Tiny bits of the drum
    • The same air, from the drum to the ears
    • Energy, passed along by vibrating air

  9. Ren shakes a rope harder, so the crests get taller. What does that show?

    • The wave has less energy
    • The wavelength got longer
    • The wave carries more energy

  10. Which sound wave carries more energy: a soft hum or a loud shout, Tala?

    • The loud shout, with its bigger amplitude
    • Both the same, since both are sound
    • The soft hum, since small waves carry more

  11. Zee drops a big stone and a small pebble into a pond. Which makes taller ripples?

    • The pebble, since small things make big waves
    • The big stone, which gives more energy
    • Neither; ripple height has nothing to do with energy
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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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