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

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

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

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

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

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

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