INVESTIGATING SOUND

Sound

Wave

Form of energy that travels through matter as waves

Disturbance that transfers energy from point to point

FrequencyThe number of waves produced in a unit of time

PitchThe highness or lowness of a sound

AmplitudeMeasure of the amount of energy in a sound wave

VIBRATIONThe back & forth movement of matter where

energy is transferred

VACUUM (SPACE)

NO MATTER

SOUND CANNOT TRAVEL

SOLIDMOLECULES OF MATTER

CLOSER TOGETHER

Transmit

SoundFastest

GASESMOLECULESOF MATTERFARTHER

APART

Transmit

SoundSlowest

SOFTOBJECT

MOST OF SOUND

ABSORBED

FREQUENCY PITCH

FREQUENCY PITCH

AMPLITUDE LOUDERSOUND

AMPLITUDE SOFTERSOUND

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?

SOUNDSTATIONSACTIVITY

How do we hear sound?

Why do humans & animalshear & 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•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

MUSICAL INSTRUMENTS

StringInstruments

Produce sound by vibrating strings

WoodwindInstrumen

ts

A vibrating reed helps to make the sound

MUSICAL INSTRUMENTS

BrassInstruments

Vibrating air makes the sound

Percussion

Instruments

Produce sound by being hit or shaken

MUSICAL INSTRUMENTS

Piano and Other

Instruments

Strings of different

lengths hit by small

hammers to produce sound

Voice

Vibration of vocal chords makes sound

MAKE YOUR OWNMUSICAL INSTRUMENT