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8th grade Wavelength, amplitude and frequency worksheet

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Wavelength, amplitude and frequency

Grade 8 Science Worksheet

NameDate

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

  1. A cork floating in a ripple tank bobs up and down 10 times in 5 seconds. What is the frequency of the ripples, Ari?

  2. A cork floating in a ripple tank bobs up and down 16 times in 2 seconds. What is the frequency of the ripples, Bo?

  3. A cork floating in a ripple tank bobs up and down 30 times in 6 seconds. What is the frequency of the ripples, Esme?

  4. In the wave graph, what is the wavelength, Jun?

    • 20 cm
    • 30 cm
    • 120 cm
    • 60 cm

  5. Waves travel along a rope at the same speed. Milo starts shaking it faster, a higher frequency. What happens to the wavelength?

    • It gets longer
    • The amplitude doubles instead
    • It stays the same
    • It gets shorter

  6. Two notes travel through the same air. One has a higher pitch, a higher frequency. Which has the shorter wavelength, Noah?

    • The lower-pitched note
    • The louder note
    • The higher-pitched note
    • Both the same, since they share a speed

  7. Two ripple waves move at the same speed. Wave A has a 3 cm wavelength and wave B a 6 cm wavelength. Which has the higher frequency, Pia?

    • Wave B, since longer waves are louder
    • Wave B, since its waves are longer
    • Wave A
    • Both the same

  8. Ren pushes and pulls one end of a stretched slinky along its length. What travels along the slinky?

    • Bunched-up coils, a squeeze
    • Up-and-down crests, like a rope
    • The end coils, to the far end
    • Nothing; a slinky can't carry a wave

  9. How is a sound wave in air like a slinky wave, Tala?

    • Both travel faster when they are bigger
    • Both are squeezes and stretches moving along
    • Both move up and down like a rope
    • Both carry the air or coils to the far end

  10. Zee pushes the slinky harder, so the coils bunch up more tightly. What has changed?

    • The amplitude, so it carries more energy
    • The wavelength doubles
    • The coils now travel to the far end
    • The speed: the squeeze moves faster
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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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