Monday, September 30, 2013
Take out the following:Pencil or PenPlanner (p.38)Energy WorkbookRainbow Reading
What is a medium?
Any substance like AIR, WATER or STEEL.
(GAS, LIQUID, OR SOLID)
Do you think that sound waves would travel faster in water or pancake syrup? Why?
Not all sounds are the same…
The pitch you hear depends on the frequency of the sound wave.
Frequency = vibrations / second
High pitch= LOTS of vibrations / second
Low pitch= FEW vibrations / second
When a drummer hits a cymbal, it vibrates. The cymbal has kinetic energy.
Draw a diagram of a sound wave moving from a cymbal to a person’s ear.
Fill in the Blanks
The __Motion__________ energy of the vibrating ____________ passes to the air molecules.
The energy in the air spreads out and is detected by your _____________ as ______________.
CYMBAL
EARSOUND
Write your OBSERVATIONS! What do you feel?
What do you hear?
What is the medium?
What happens to the medium when the sound wave travels through it?
Make your OBSERVATIONS! What do you see?
What do you hear?
What is the medium?
What happens to the medium when the sound wave travels through it?
1. You go to a coffee shop and listen to a
guy play guitar. Draw a diagram
illustrating why you hear the music.
2. Explain your diagram by filling in the blanks below. (use the following words): kinetic, air particles, vibrates, ear, longitudinal, sound.
When the guy plays the guitar, the _________ energy of the strings transfers energy to the _____________as ____________energy causing them to move in a ____________ wave.
The longitudinal wave travels all the way to my ___________, where it _________ the ear hairs inside and my brain registers the vibrations as music.
1. You go to a coffee shop and listen to a guy play guitar. Draw a diagram
illustrating why you hear the music.
+1 guitar and ear
+1 air particles moving in waves
+1 Arrow from guitar to ear
+1 labels
AIR PARTICLES
Guitar
Ear
2. Explain your picture.
When the guy plays the guitar, the kinetic energy of the strings transfers energy to the air particles as sound energy causing them to move in a longitudinal wave.
The longitudinal wave travels all the way to my ear, where it vibrates the ear hairs inside and my brain registers the vibrations as music.
+6 points
4. What determines if a pitch will sound high or low?
The higher the frequency of the sound wave, the higher the pitch. The lower the frequency of the sound wave, the lower the pitch.
The frequency (speed) of the wave determines the pitch of the sound.
+1 point