1. Science Unit C / Section C Mrs. Zepp
Sound
Science
Unit C / Section C
Mrs. Zepp

2. What Is Sound? Sounds make things shake or vibrate
Sound travels as a wave
Back-and-forth vibrations of objects cause waves in the air that travel to your ear

3. How Sound Travels Sound travels best through
1st Solids – wood or plastic
2nd Liquids – water
3rd Gases – air
Deaf people feel sound vibrations through their hands, feet, and body

4. Making Sounds
The harder you pluck an instrument, the louder it sounds.
Thicker strings produce lower sounds.
Megaphone – instrument used to make sounds louder

5. Hearing Sounds Sound waves move through the air Hit the outer ear
Sound waves bounce off the outer ear
Into the eardrum (thin circle of tissue)
Eardrum vibrates
Sends signal through the nerves to the brain
Brain interprets the signals as sounds

6. Animal Ears Jack rabbit – long ears Fox – sharp hearing
Cat – moves ears around to pick up sounds
Bat – high pitched squeaks hit insects and bounce back as an echo

7. Sonar Instrument used to determine how far away an object is
Sends a ping sound down into the ocean
The ping echoes back
Sonar instrument times how long it took for the sound to make the round trip
Determines how far away the object is