Science Test (3/30)

The pitch of a sound that you hear depends on the sound wave’s

• loudness

• frequency

• intensity

• speed

The changing pitch of a police car’s siren as it moves by you is an example of

• the Doppler effect

• resonance

• the speed of sound

• intensity

The speed of sound depends on

• the loudness of the sound

• the pitch of the sound.

• the source of the sound.

• the properties of the medium it travels through

As a sound source moves toward a listener, the pitch

• appears to decrease

• appears to increase

• stays the same

• goes up and down repeatedly

Loudness, or sound level, is measured in units called

• decibels

• hertz

• meters per second

• watts per square meter

The ability of a material to bounce back after being disturbed is called

• density

• elasticity

• intensity

• frequency

Sound waves with frequencies above 20,000 Hz are called

• ultrasound

• infrasound

• sonar

• echolocation

A system of detecting reflected sound waves is

• dissonance

• infrasound

• sonar

• acoustics

You can hear sounds from around corners because of

• refraction

• reflection

• diffraction

• elasticity

What occurs when two or more sound waves interact?

• interference

• Doppler effect

• resonance

• ultrasound