Sound and Amplitude

What is sound?

• Sound is a form of energy.

• Sound travels in waves.

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.

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

BIG vibrations...

• make LOUD sounds!

Small vibrations...

• make quiet sounds

Sound must have MATTER to travel through.

• Think of the sound moving through the guitar string, or think of the rumble in your chest from a marching band during a parade.

• Thanks to air particles sound can travel freely on earth.

• Do you think there is sound in space?

  
  

Sound Energy

• sound is energy in the form of vibrations passing through matter

• A vibration is a quick back and forth movement.

• Sound occurs when objects vibrate.

• Sound travels through solids, liquids and gases.

• Sound cannot travel through empty space where there is no matter.

Multiple Choice

What is energy in the form of vibrations passing through matter?

• sight

• sound

• vibrations

Multiple Choice

What is a vibration?

• particles

• a quick back and forth movement

• a compression

Multiple Choice

Sound cannot travel through...

• solid

• liquid

• gas

• empty space

Multiple Choice

2. When vibration stops, the sound stops.

• TRUE

• FALSE

Sound Waves

• Molecules move by pushing forward and spreading

• Needs matter to travel through

Volume

• When we describe a sound, we often mention its loudness, or volume.

• Some sounds are louder than others.

• Volume is the measure of how strong or intense a sound seems to us.

• The more energy there is in the sound wave, the louder the sound.

Amplitude

• Height of wave from its resting point.

• The higher the amplitude of a wave, the more energy it has, and the louder it sounds.

Frequency

• How many waves pass a point in one second.

• Measured in hertz

Amplitude

Amplitude is also referred to as the wave height. The taller the wave, the louder the sound.

The higher amplitude the more energy!

Wavelength vocabulary

Amplitude examples

• A higher wave during a tsunami causes greater destruction.

• A louder sound wave can cause hearing damage.

Amplitude examples

• A higher wave during a tsunami causes greater destruction.

• A louder sound wave can cause hearing damage.

Multiple Choice

What is the measure of how strong or intense a sound seems?

• frequency

• volume

• pitch

Multiple Choice

What role does energy play in sound?

• Sound waves have nothing to do with energy.

• Sounds waves carry energy.

• Energy is present in loud sounds only.

• Energy is present in high-pitched sounds but not in low-pitched sounds.

Multiple Choice

What does volume measure?

• the speed of a sound

• the frequency of a sound

• the highness or lowness of a sound

• the loudness or softness of a sound

Multiple Choice

What does amplitude measure?

• frequency

• volume

• pitch

• echoes

Multiple Choice

What carries sound?

• particles in the air

• water

• ears

Multiple Choice

What do we call the path of vibrating particles through the air?

• air

• wave

• music

Multiple Choice

Which wave has a greater amplitude?

• Solid Line

• Dotted Line

Multiple Choice

Which wave has the quietest volume?

• 1

• 2

• 3

Multiple Select

Which two waves have the same amplitude? Choose 2 answers.

• 1

• 2

• 3

Multiple Choice

Which graph has the higher amplitude?

• Graph A

• Graph B

Multiple Choice

Isaiah has built a giant speaker so that he can play music really loudly. He has set the speaker right outside his neighbor’s house. What will happen to the glass window of the house when Isaiah starts playing music using the large speaker.

• The neighborhood dogs will start barking.

• The air around the speaker will heat up.

• The sound waves from the speaker will vibrate, causing the air near the speaker to vibrate. This will cause the window to move and possibly break.

• The speaker will use so much energy that the power will go out on the entire street.