Investigating sound

Sound Wave Form of energy that travels through matter as waves Disturbance that transfers energy from point to point

Frequency Pitch Amplitude The number of waves produced in a unit of time Pitch The highness or lowness of a sound Amplitude Measure of the amount of energy in a sound wave

The back & forth movement of matter where energy is transferred Vibration The back & forth movement of matter where energy is transferred

VACUUM (SPACE) NO MATTER SOUND CANNOT TRAVEL

SOLID GASES Transmit Sound Fastest Transmit Sound Slowest MOLECULES OF MATTER CLOSER TOGETHER SOLID Transmit Sound Slowest MOLECULES OF MATTER FARTHER APART GASES

MOST OF SOUND ABSORBED SOFT OBJECT SOUND WAVES

FREQUENCY PITCH FREQUENCY PITCH

LOUDER SOUND AMPLITUDE SOFTER SOUND AMPLITUDE

STRAW ACTIVITY Place pointed end in mouth past cut portion Blow air through straw Trim straw to make it shorter What happened to the pitch?

SOUND STATIONS ACTIVITY

How do we hear sound?

hear & make noise differently? Why do humans & animals hear & make noise differently? Animal brains are not as complex as those of humans Some species do not have vocal cords. The vocal tracts of animals may differ in shape and size, so vocalizations sound different

SONAR ECHOLOCATION SOUND NAVIGATION USES SOUND WAVES TO DETECT OBJECTS FAR AWAY ECHOLOCATION FORM OF SONAR USED BY MARINE MAMMALS TO OBTAIN INFORMATION ABOUT SURROUNDINGS AND TO FIND FOOD

Produce sound by vibrating strings MUSICAL INSTRUMENTS Produce sound by vibrating strings String Instruments A vibrating reed helps to make the sound Woodwind Instruments

Vibrating air makes the sound Produce sound by being hit or shaken MUSICAL INSTRUMENTS Vibrating air makes the sound Brass Instruments Produce sound by being hit or shaken Percussion Instruments

MUSICAL INSTRUMENTS Piano and Other Instruments Strings of different lengths hit by small hammers to produce sound Piano and Other Instruments Vibration of vocal chords makes sound Voice

MAKE YOUR OWN MUSICAL INSTRUMENT