Waves - Sound5

Sound is able to travel faster in solids than in air because the molecules in a solid are

• closer together than air molecules
• more easily moved than air molecules
• moving faster than air moleculesmoving faster than air molecules
• larger than air molecules

Bruce plays his violin every Friday night for the symphony. Before he plays, he plucks each string to see if his violin is in tune. Which is most responsible for the generation of sound waves from his violin?

• material of the violin
• vibrations of the string
• movement of the violin
• composition of the string

Tags

NGSS.MS-PS4-1

Sound waves travel the fastest through

• rock
• seawater
• space
• atmosphere

Sound waves travel the fastest through dense materials. Through which of these would sound waves travel the SLOWEST?

• air
• glass
• metal
• water

The loudness of sound can be changed by

• decreasing pitch
• increasing the frequency
• increasing the amplitude
• decreasing the wavelength

Tags

NGSS.MS-PS4-1

A doorbell circuit converts electrical energy into mechanical energy. The mechanical energy is in the form of vibrations that ultimately produce

• chemical energy
• thermal energy
• radiant energy
• sound energy

The sound heard when a piano key is hit is caused by

• vibration
• refraction
• momentum
• acceleration

A substance that carries sound waves is called

• a fulcrum
• a medium
• a spectrum
• equilibrium

Leilani plays a knee drum.
When she strikes the drum with the mallet, it makes a sound. Why does the drum make a sound?

• because her knee moves
• because the drum head is round
• because the top of the drum vibrates
• because the mallet is made of wood

A sound wave travels at different speeds through different substances. Through which substance would a sound wave travel faster?

• solid ground
• bright light
• outer space
• dry air