1. AIM: What is sound?

2. AIM: What is sound?

3. AIM: What is sound?

5. AIM: What is sound?

6. AIM: What is sound?

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

8. AIM: What is sound?
Vocbulary

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

10. 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!

11. Therefore sound wave must be ??? ENERGY
What do we Know?
A wave is a form of ???
ENERGY.
Sound travels in ???
WAVES.
Therefore sound wave must be ???
ENERGY

12. What do you feel when you place your hand on on your stereo speaker?
Try this!
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?
Vibrations!

13. List all the sounds we hear in this room in your notebook!
What do we Know?
Waves are caused by ?
vibrations.
Therefore sound is caused by?
List all the sounds we hear in this room in your notebook!

14. What were the two types of waves we have studied so far?
What do we Know?
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

15. What are the features of a longitudinal wave?
What do we Know?
What are the features of a longitudinal wave?
Compression, rarefaction, wavelength
What type of wave is a sound wave?
Longitudinal Wave

17. Through which medium do
the sound waves travel?

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

19. OH 61:
Drum make vibrations
Through which medium to the sound waves travel?

20. What is a mechanical wave? A wave which requires a medium.
What do we Know?
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

21. Does sound travel through air? Does sound travel through a solid?
Is it true ?
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?

22. Does sound travel through water? Lets find out!
What do we Know?
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.

23. What is the speed of sound in air? 340 m/sec
AIM: What is sound?
What is the speed of sound in air?
340 m/sec
Does sound travel faster in water?
1500 m/sec

24. AIM: What is sound?
Speed of Sound

25. AIM: What is sound?
Make a Bar Graph!

26. Speed of Sound

27. Graph this in a line graph

28. Speed of Sound

29. How does air temperature affect the speed of sound?
Pop Quiz!
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

30. Sound travels through a ?
AIM: What is sound?
Summary
Sound is a form of ?
Sound travels through a ?
Sound travel faster in ____, than in ______ .
When the temperature is warmer, sound waves travel ?

31. AIM: What is sound?
Class Activity:
W/S Concepts 8-1, 8-2, 8-3

32. AIM: What is sound?
Homework:
INTERNET QUESTIONS