Sound Waves

Why does sound not travel through space (vacuum)?

• There are no particles in space to carry sound waves.

• Space is too cold for sound to travel.

• Space contains too many gases to carry sound waves.

• Space has no gravitational force to affect sound.

In a sound wave, particles vibrate perpendicular to the direction the wave is traveling.

• True

• False

Sound travels as a vibration of particles in a ___ (solid, liquid, gas), but cannot travel through a ___ (vacuum).

• Gas

• Vacuum

When a tuning fork is struck, it vibrates. What happens to the surrounding air particles?

• They vibrate in all directions.

• They move away from the fork in a circular motion.

• They vibrate back and forth in the same direction as the sound wave.

• They remain still.

An echo is heard when sound waves are reflected off a surface and return to the listener.

• True

• False

The sound waves travel towards a ___ surface and are reflected back, creating an echo.

Which of these factors will affect how clearly an echo is heard?

• The volume of the sound

• The distance between the sound source and the reflecting surface

• The color of the surface

• The temperature of the air

An echo is only heard if the sound waves are reflected from a surface and the reflected sound takes ___ seconds to reach the listener.

Electricity is the flow of protons through a wire.

• True

• False

In a simple electrical circuit, electrons move from:

• The negative terminal to the positive terminal of the battery

• The positive terminal to the negative terminal of the battery

• The ammeter to the battery

• The wire to the lamp