Sound Waves

1. A wave is a disturbance that carries through matter or empty space.A. matterB. particlesC. energyD. a mediumE. water

2. Electromagnetic waves .A. are transverse wavesB. require a mediumC. are mechanical wavesD. are longitudinal wavesE. are tortional

3. Waves that require or travel through a medium are called .A. longitudinal wavesB. transverse wavesC. mechanical wavesD. tortional wavesE. all of the above

4. For which type of waves do particles in the medium vibrate perpendicular to the direction in which the wave is traveling?A. transverse wavesB. longitudinal wavesC. P wavesD. all of the aboveE. None of the above

ReviewReviewMechanical wavesElectromagnetic wavesTransverse wavesLongitudinal wavesCharacteristics of waves

SoundSound Is a longitudinal waveNeeds a medium to travel through

The source of a sound wave vibrates rapidly

SoundSound This causes

pressure vibrations

Which causes air molecules to vibrate

SoundSoundAir molecules bunch together in some places

CompressionsSpread out at other places

Rarefactions

PitchPitch

How high or how low a sound is

Not how loud Depends on the frequency Faster the frequency, the higher the pitch

PitchPitch Low pitch High pitch

Same amplitude, different

frequency

LoudnessLoudness Depends on the amplitude

Higher amplitude, louder sound

LoudnessLoudness

Quiet

Loud

Same frequency, different

amplitude

EchoEcho Sound waves that bounce off a surface

Sound will reflect off hard surfaces

They will be absorbed by soft surfaces

ResonanceResonance

When two objects naturally vibrate at the same frequency