Wavelength, amplitude and frequency

Answer Key - Grade 8 Science Worksheet - Building Confidence

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

1. 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?

   30 cm
2. 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?

   10 cm
4. 3.

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

   • 80 cm
   • 30 cm
   • 60 cm
5. 4.

   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. 5.

   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. 6.

   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. 7.

   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. 8.

   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. 9.

    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. 10.

    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