| A | B |
|---|
| A thick blanket of this surrounds the Earth. | air |
| This air is made of tiny invisible _____. | particles |
| Sound is a kind of __________. | energy |
| Sound travels through the particles in air to your ___________. | ears |
| Since sound is a form of energy, sound has the ability to | 1. Move things 2. Make things happen |
| Sound moves through air by making the tiny particles in air __________. | Vibrate |
| What does vibrate mean? | To move back and forth |
| The vibration of one particle causes the ____________ next to it to vibrate. | particle |
| The vibrations _________ out to other particles causing the sound energy to move away from the object making the sound. | spread |
| The bat _______ the ball causing the ______ to vibrate creating a ____________, | Hits, air, sound |
| How fast does air travel though sound through air near the ground? | 750 miles per hour |
| Air moves more slowly high above Earth because there are ________ air particles. | fewer |
| Sound waves move out in__________ direction from their original sources | Waves |
| Water waves travel in 1 direction and sound waves travel _______ in every direction. | Out |
| Every sound that you hear comes to you as a _______________ | Sound Wave |
| How many parts does a sound wave have? | 2 |
| In one part of a sound wave, the particles of air are squeezed or _____. | Compressed |
| In the other part of a sound wave, the air particles are _______ _______. | Spread out |
| _______ sound waves have more particles. | loud |
| ______ sounds have fewer particles. | soft |
| ________ is the loudness of a sound. | Volume |
| The _______ that you beat a drum with passes from you to the drum to the particles of air around the drum. | energy |
| Volume is measured in ________. | Decibels |
| How many decibels does rock music make? | 190 decibels |
| How many decibels of sound does breathing make? | 10 |
| If a sound is high or low, this is called ___________. | pitch |
| Thunder has a _______ pitch. | Low |
| A whistle has a ______ pitch. | High |
| In high pitch sounds, compressed bands are ___________ together. | Closer |
| In low pitch sounds, compressed bands are _________ apart. | Farther |
| Does sound travel through other matter besides air? | Yes |
| Does sound travel more easily through solids and liquids than through air? | Yes because there are more particles in solids and liquids than in air. |
| It is easier for vibrations to mov from particle to particle when the particles are closer together | true |
| Do some airplanes travel faster than air? | yes |
| When airplanes travel faster than air, a _____ _____ happens | Sonic boom |
| The farther you are from an object making sound, the ___________ it is to hear. | harder |
| As sound waves move away from a vibrating object, they slowly _____ their energy. | lose |
| Loud sounds have more energy, so it takes them ________________ to lose their energy and they travel farther, too. | longer |
| How far can the sound of a blue whale travel? | 100s of miles |
| What are echoes? | Sound waves that bounce off of hard surfaces and return seconds later after they left their original source |
| How can echoes be reduced in a room? | Adding curtains and soft furniture |
| Adding curtains and soft furniture ___________ sound waves in a room. | Absorbs |
| Sounds bounces off hard things in a room like __________. | Walls |
| True or False. Your ears are shaped to gather sound waves and move them into your ear. | True |
| What is the tightly stretched patch of skin inside of your ear that vibrates when sound waves hit it. | Eardrum |
| Then the eardrum passes the vibrations to the middle ear where there are 3 tiny ________ that vibrate | bones |
| The most important part of the inner ear is the_____________. This is shaped like a snail shell. | Cochlea |
| The cochlea is filled with liquid in it that vibrates. The cochlea has tiny ____ lining the inside of it that change the vibration to a signal. | Hairs |
| The tiny hairs in the cochlea connect to ______ in the brain. These nerves carry messages from the ears to the brain. | Nerves |
| Finally, the brain ________ the signal. | interprets |
