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Sound waves are caused by


Your hearing can be damaged by

high-intensity sounds

The intensity of a sound is determined by its


Nina listens to an ambulance as it travels past her. The sound of the siren

decreases in pitch

The sound of your voice is produced by the

force of air making your vocal cords vibrate

Jorge wants to make the pitch of a sound wave lower. He should

decrease its frequency

Brian turns up the volume on his stereo. The stereo sends an electrical signal to the speakers. The signal changes the sound's


To raise the pitch of the sound caused by a sound wave,

increase the frequency of the sound

A sound wave has a frequency of 300 hertz. How many complete wavelengths of this wave pass a fixed point in one second?


Anna plays a note on a clarinet. Fred plays the same pitch on a violin. The two notes sound different. This is because the two notes have different


Sound becomes softer at a distance because the

energy of the sound wave is spread over a greater area, decreasing its intensity

A car's muffler and some kinds of acoustical tile make sounds softer by

absorbing energy from sound waves

Intense sounds can damage your hearing by

damaging the hair cells of the cochlea

A mechanical wave always transfers energy

through a medium

The frequency of a wave is measured in


Sound travels faster in materials that are


If you compare the sound of a motorcycle being driven toward you to the sound of the same one being driven away, you are hearing the

Doppler Effect

The bones of the middle ear

carry vibrations from the eardrum to the inner ear

When you speak, your

vocal cords vibrate to produce sound

A sound wave transfers kinetic energy between particles by

compressing them

Sound waves can not travel through a


As the temperature of the medium increases, the speed of sound


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