Sound waves are longitudinal waves Sound is created

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{ Sound waves are longitudinal waves. Sound is created by vibrationscompressions and rarefactions. Sound

{ Sound waves are longitudinal waves. Sound is created by vibrationscompressions and rarefactions. Sound needs a medium to travel. What is sound?

1. 2. { 3. 4. 5. 6. Sound waves vibrate the ear drum. Vibrations

1. 2. { 3. 4. 5. 6. Sound waves vibrate the ear drum. Vibrations in ear drum makes the hammer vibrate, Which vibrates the stirrup. Which vibrates the liquid inside the cochlea. Which moves the liquid and cause tiny hairs to move. Which stimulate nerves sending the signal to you brain. How does the human ear work?

Loud sounds damage the hair cells and the nerve endings in the cochlea.

Loud sounds damage the hair cells and the nerve endings in the cochlea. Once damaged they do not repair or grow back. Any exposure to loud sounds can cause hearing loss. Hearing Loss

Damage can occur at 85 decibels. 140 decibels is painful.

Damage can occur at 85 decibels. 140 decibels is painful.

Click HERE or HERE to test your hearing with Mosquito Ringtones

Click HERE or HERE to test your hearing with Mosquito Ringtones

{ Pitch How high or low a sound is. A flute is high A

{ Pitch How high or low a sound is. A flute is high A tuba is low Pitch depends on the frequency of the sound wave { Frequency The number of waves in a given time. High frequency is high pitched Low frequency is low pitch Frequency range for humans is 20 Hz 20, 000 Hz How are pitch and frequency related?

Pitch? Frequency?

Pitch? Frequency?

{ Change in frequency caused by the motion of the listener or the source

{ Change in frequency caused by the motion of the listener or the source Doppler Effect

Doppler Effect in action { Click HERE for a video explanation of the Doppler

Doppler Effect in action { Click HERE for a video explanation of the Doppler Effect

{ Loudness How well a sound can be heard Soft sounds are hard to

{ Loudness How well a sound can be heard Soft sounds are hard to hear and have less energy Loud sounds are easy to hear and have more energy { Amplitude Distance from the rest position Smaller amplitude=softer sound Larger amplitude=louder sound How are loudness and amplitude related?

{ Soft sound { Small amplitude

{ Soft sound { Small amplitude

{ Loud sounds { Large Amplitude

{ Loud sounds { Large Amplitude

Amplitude?

Amplitude?

Echolocation Sonic boom Resonation Interactions of Sound Waves

Echolocation Sonic boom Resonation Interactions of Sound Waves

Echo is a reflected sound wave. Echolocation is using reflected sound waves to find

Echo is a reflected sound wave. Echolocation is using reflected sound waves to find an object Echolocation

Explosive sound heard when a shock wave reaches your ear. Happens when a jet

Explosive sound heard when a shock wave reaches your ear. Happens when a jet goes faster then the speed of sound Sonic Boom

Sound produced by one object causes the other object to vibrate Resonance

Sound produced by one object causes the other object to vibrate Resonance

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