AIM: What is sound? sound is a form of energy Describe how sound travels Differentiate how sound waves travel though different mediums AIM:

AIM: What is sound?

AIM: What is sound?

AIM: What is sound?

AIM: What is sound?

AIM: What is sound?

sound is a form of energy

Describe how sound travels

Differentiate how sound waves travel though different mediums

AIM: What is sound?

AIM: What is sound?

If a tree falls in the woods and nobody hears it, does it make any sound?

If sound is something which is heard by one’s ear then the answer is no.

If sound is something which is created by a vibration, then the answer is yes!

A wave is a form of ???

ENERGY.

Sound travels in ???

WAVES.

Therefore sound wave must be ???

ENERGY

What do you feel when you place your hand on on your stereo speaker?

What do you feel when you place your hand on your throat when you speak?

Waves are caused by ?

vibrations.

Therefore sound is caused by?

vibrations.

List all the sounds we hear in this room in your notebook!

What were the two types of waves we have studied so far?

Transverse and Longitudinal.

What are the features of a transverse wave?

Crest, Trough, Wavelength

What are the features of a longitudinal wave?

Compression, rarefaction, wavelength

What type of wave is a sound wave?

Longitudinal Wave

Through which medium do the sound waves travel?

AIR! Air is one medium through which a sound wave may travel

OH 61:

Drum make vibrations

Through which medium to the sound waves travel?

What is a mechanical wave?

A wave which requires a medium.

Sound waves are mechanical waves.

Will sound waves travel in a vacuum?

NO, sound needs a medium to travel

Does sound travel through air?

Does sound travel through a solid?

Can you hear your mother screaming through your closed bedroom door?

Doesn’t sound travel through phone lines?

Does sound travel through water?

Lets find out!

•Fill an aquarium with water

•Hit two rock together

•Does anybody hear any sound?

•Yes, sound travels through water.

What is the speed of sound in air?

340 m/sec

Does sound travel faster in water?

1500 m/sec

AIM: What is sound?

Speed of Sound

Material Speed (m/sec) Air 340 water 1498 steel 5200 rubber 60 glass 4540 wood 1850

AIM: What is sound?

Make a Bar Graph!

AIM: What is sound?

Speed of Sound

0

1000

2000

3000

4000

5000

6000

air water steel rubber glass wood

Graph this in a line graphTemperature Speed of sound (m/sec) -20 Degrees C 318 -10 324 0 330 10 336 20 342 30 348

Speed of Sound

How does air temperature affect the speed of sound?

Warmer Air >> Faster Sound

Does sound travel faster at the North Pole or the Equator?

Equator

Sound is a form of ?

Sound travels through a ?

Sound travel faster in ____, than in ______ .

When the temperature is warmer, sound waves travel ?

AIM: What is sound?

Class Activity:

W/S Concepts 8-1, 8-2, 8-3

AIM: What is sound?

Homework:

INTERNET QUESTIONS

AIM: What is sound?