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