Sound Energy

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​Sound Energy

​What is Sound?

• ​Sound is a form of energy made through vibration that creates waves of pressure that moves through mediums.

​■Sound occurs when..

​■there is a back-and-forth movement called VIBRATION.

■You can see drums vibrate when you strike them or the strings on a guitar vibrate when you pluck them.

Multiple Choice

The movement in sound that allows us to hear

• dancing

• bouncing

• vibration

When strings are plucked on a guitar, the strings VIBRATE to create sound energy!

​■make LOUD sounds!

■​BIG vibrations...

​■Small vibrations...

​■​make quiet sounds

​S-L-O-W vibrations make...

​lower pitch because its a slower frequency.

FAST vibrations make...

higher pitch because its a faster frequency.

What is pitch?

• Pitch is how HIGH or how LOW a sound is.

  Think of an opera singer hitting a high note in her song

Multiple Choice

Pitch is.....

• The volume of a song

• The steady pulse of music

• How high or low a note sounds

​Now lets transitions from Sound waves to Pressure waves

• ​Push your hand down on your desk, that is the you applying pressure to a solid

• ​When your vocal cords vibrate they create pressure waves in the air bouncing air particles together in a ripple that makes a sound

• ​What we have been making are graphs of sound waves

Multiple Choice

Sound moves in waves of...

• PRESSURE!

• ..

​Compressions: area of sound waves where molecules are closer together

​

Rarefaction: area of sound where molecules are further apart

​

​Wavelength: distance from end of compression to the end of the next compression​

​

​Frequency: the number of waves produced per second

​Sound travels through MATTER...

• ​Solid, Liquid, and Gases

• ​

• ​Sound travels by pushing the particles of a substance. The particles push into the particles next to them, and then return to their original position. And the sound continues to travel in this form until it reaches your ear!

Multiple Choice

Sound travels by...

• pushing the particles of a substance in a wave-like pattern

• flying through the air

• sliding like a ghost through a door

Draw

Draw what the particles look like in a Solid, Liquid, and Gas

​Through which form of Matter do you think sound travels the fastest?

Multiple Choice

Sound travels fastest through...

• Gases

• Liquids

• Solids