As a sound source moves towards a listener, the pitch ____________

• appears to increase

• appears to decrease

• remains the same

• goes up and down repeatedly

Loudness, or sound, level is measured in units called ____________

• hertz (Hz)

• decibels (dB)

• joules

You can hear sounds from around the corner because of _________________

• diffraction

• reflection

• refraction

• deflection

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

• the Doppler Effect

• Newton's laws of sound

• J Joules laws of energy

T or F? The pitch of a sound you hear depends on the sound wave's frequency

• true

• false

Doctors are able to make sonograms through the use of ______________

• infrasound

• ultrasound

• sonar

Tags

NGSS.MS-PS4-2

The speed of sound depends on ____________

• the medium it travels through

• pitch of sound wave

• loudness of source

• distance to the source of the wave

Tags

NGSS.MS-PS4-2

T or F? The frequency of the sound waves produced by a string increases as the tension of the string decreases.

• true

• false

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

• density

• elasticity

• intensity

• frequency

The compressions and rarefactions that make up a sound wave traveling through the air are

• differences in air pressure

• echoes

• differences in pitch

• examples of infrasound

Tags

NGSS.MS-PS4-1