SOUNDGet Ready for the

Pitch

Bill Nye the Science Guy

http://www.youtube.com/watch?v=DZs4LlHwOds&feature=iv#t=2m06s

PitchWhat do you know about pitch and sound

waves?

Why do you think pitch is high or low?

Prediction Graph with RulersWhich bottle has the highest pitch?

Red Yellow Green

High

Middle

Low

So, GREEN has the highest pitch!Why does the green bottle have the highest

pitch?

Let’s try something else!What if we blow air over the top of bottle…?

Will the results be the same?

Why do you think this?

Prediction Graph with BlowingWhich bottle has the highest pitch?

Red Yellow Green

High

Middle

Low

So, RED has the highest pitch now!Why does the red bottle have the highest

pitch now?

One Final ExampleTuning Forks!

Using everything we’ve learned, which one will have the higher pitch?

Time to write in your notebooks!PITCH MAKES A SOUND “HIGH” OR “LOW”.IT DEPENDS ON FREQUENCY.OBJECTS WITH LESS MATTER VIBRATE

FASTER.FASTER VIBRATION = HIGHER

FREQUENCYHIGHER FRQUENCY = HIGHER PITCHOBJECTS CAN VIBRATE, OR THE AIR

INSIDE THEM. THIS AFFECTS THE PITCH YOU GET!

Who likes Myth Busters?Here’s something cool!

Do NOT try this at home!

http://www.youtube.com/watch?v=ynqzeIYA7Iw&NR=1&feature=fvwp

http://www.youtube.com/watch?v=gpCquUWqaYw