Transverse, longitudinal and sound waves

Grade 8 Science Worksheet - Challenge Me

Circle the best answer.

1. 1.

   Sound travels about 1,480 m/s in fresh water and 343 m/s in 20 °C air. About how long does sound take to cross 3,000 m of lake water, Bo?

   • About 4,400 s
   • About 9 s
   • About 0.5 s
   • About 2 s
2. 2.

   Sound crosses 343 m of 20 °C air in about 1 s. Steel carries sound at about 5,900 to 6,000 m/s. About how long do 343 m of steel take, Esme?

   • About 17 s
   • About 0.06 s
   • About 0.6 s
   • About 1 s
3. 3.

   Jun plays a 343 Hz note near a pool, and the sound passes from the air into the water. Which property of the sound stays the same?

   • Its wavelength
   • Its speed
   • Nothing: sound cannot enter water
   • Its frequency
4. 4.

   In 20 °C air, a 343 Hz note has a wavelength of 1 m. In water, sound goes about 1,480 m/s. About what is the note's wavelength in water, Kira?

   • About 4.3 m
   • About 0.23 m
   • 1 m
   • About 1,480 m
5. 5.

   Milo says sound in air must be a transverse wave, because books draw it as a wiggly line. Agree or disagree?

   • Disagree: sound is not a wave
   • Agree: the wiggle shows air moving up and down
   • Disagree: the air moves along the path
   • Agree: waves are transverse
6. 6.

   Noah says the sound from a speaker pushes the same air all the way across the room to your ear. Agree or disagree?

   • Agree: the air flows to your ear like a breeze
   • Disagree: the air stays; the energy travels
   • Agree: louder sounds carry more air along
   • Disagree: sound needs no air
7. 7.

   Pia says a wave on a rope carries the rope's fibers to the far end. Agree or disagree?

   • Disagree: the bits move in place
   • Agree: a bigger wave carries more rope
   • Disagree: a rope can't carry a wave
   • Agree: the fibers ride the wave to the end
8. 8.

   Ren chooses a model to show sound moving through air. Which model fits best?

   • A rope wiggling up and down
   • Balls of air rolling from speaker to ear
   • A spring with bunched and spread coils
   • A single still dot
9. 9.

   Tala chooses a model to show light from a lamp. Light is an electromagnetic wave. Which model fits best?

   • Air particles carrying the light along
   • Bunched and spread coils along the path
   • A spring standing still
   • A wiggle across the direction of travel
10. 10.

    Zee moves a toy spring side to side, then pushes it along its length. Which pair names the two waves, in order?

    • Both transverse: the spring moves each time
    • Longitudinal, then transverse
    • Transverse, then longitudinal
    • Both longitudinal: it is a spring