Wavelength, amplitude and frequency

Answer Key - Grade 8 Science Worksheet

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

1. 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 Hz
2. 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?

   8 Hz
3. 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?

   5 Hz
5. 4.

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

   • 30 cm
   • 20 cm
   • 60 cm
   • 120 cm
6. 5.

   Using the scale, how high is the amplitude of this wave, Kira?

   Use the picture in question 4.

   • 40 cm
   • 60 cm
   • 20 cm
   • 30 cm, the top of the scale
7. 6.

   In the wave graph, which pair gives the amplitude and then the wavelength, Luz?

   Use the picture in question 4.

   • 20 cm and 60 cm
   • 40 cm and 60 cm
   • 60 cm and 20 cm
   • 20 cm and 30 cm
8. 7.

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

   • It gets shorter
   • It gets longer
   • It stays the same
   • The amplitude doubles instead
9. 8.

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

   • Both the same, since they share a speed
   • The lower-pitched note
   • The louder note
   • The higher-pitched note
10. 9.

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

    • Both travel faster when they are bigger
    • Both carry the air or coils to the far end
    • Both move up and down like a rope
    • Both are squeezes and stretches moving along
11. 10.

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

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