Waves Review: 11Feb21 Lesson

Waves Review: 11Feb21 Lesson

Review of Sound Waves and Acoustics

Multiple Choice

Can Sound Travel in a Vacuum? (A space without air molecules)

• YES

• NO

Multiple Choice

Material (matter) through which a wave travels

• medium

• Doppler Effect

• sound

• pitch

Multiple Choice

A wave that requires a medium through which to travel

• mechanical wave
• chemical wave
• electromagnetic wave
• pitch

Multiple Choice

A wave in which the vibration is in the same direction as that in which the wave is traveling; sound waves

• longitudinal wave

• ocean wave

• transverse wave

• mechanical wave

Multiple Choice

A part in a longitudinal wave where the particles are spread apart

• compression

• rarefaction

• crest

• trough

Multiple Choice

A part in a longitudinal wave where the particles are spread apart

• compression

• rarefaction

• crest

• trough

"Fun" fact

when the amplitude of a sound wave increases 10x, it sounds TWICE as loud

Multiple Choice

True or False:

The amplitude of a sound wave is measured in decibels

• TRUE

• FALSE

Multiple Choice

The amplitude isn't measured in decibles.

Decibles are a measure of ___________.

• frequency

• pitch

• volume

Multiple Choice

True or False:

The frequency of a sound wave is measured in Hertz.

• TRUE

• FALSE

Multiple Choice

True or False:

The pitch of a sound wave is measured in Hertz.

• TRUE

• FALSE

Open Ended

The big circle on the tone generator is a speaker. It is a membrane that vibrates. How do you think it is able to create different pitches and volumes?

Multiple Select

A sound wave with MORE ENERGY might have....

(check all that apply)

• increased volume

• increased pitch

Multiple Choice

Sounds can be dangerous.

High volumes can damage your eardrums because the sound waves carry a lot of _____________.

• pitch

• energy

• frequency

Multiple Choice

The air pressure is ___________ in a compression and _____________ in a rarefaction.

• higher; lower

• lower; higher

Multiple Choice

The CREST of an air pressure vs. time graph shows the pressure in the middle of a ___________________.

• compression

• rarefaction

• amplitude

• wavelength

Multiple Choice

The TROUGH of an air pressure vs. time graph shows the pressure in the middle of a ___________________.

• compression

• rarefaction

• amplitude

• wavelength

Multiple Choice

How do you count the waves on a graph or picture?

• you count the crests

• you count the troughs

• you count how many times the pattern repeats

• you count the nodes

Multiple Choice

Why do you need TIME to find frequency and speed?

• because they are both RATES

• because Mrs. Morriss said so

Multiple Select

What is true about the blue wave?

(select all that apply)

• It has a smaller amplitude

• it has a lower volume

• it has a lower pitch

• it has a lower frequency

Multiple Select

What is true about the YELLOW wave?

(select all that apply)

• it has a lower amplitude

• it has a lower frequency

• it has a lower volume

• it has a lower pitch

Multiple Choice

The number of wavelengths that pass a fixed point each second is known as ----

• Hertz

• Amplitude

• Frequency

Multiple Choice

The distance from the beginning of one compression to the beginning of the next compression is called a -----

• Rarefaction

• Frequency

• Wavelength

• Compression

Multiple Choice

Areas of increased pressure on a sound wave are known as a ----

• Rarefaction

• Compression

• Frequency

• Amplitude

Multiple Choice

Sound waves are also known as ----- waves.

• Compression

• Longitudinal

• Neither

• Both longitudinal and compression

Multiple Choice

True or False: Sound needs a medium.

• True

• False

Multiple Choice

What type of energy does a sound wave have?

• Mechanical

• Radiant

• Electrical

• Sound

Multiple Choice

What type of energy does a sound wave have?

• Mechanical

• Radiant

• Electrical

• Sound

Multiple Choice

What part of our ear vibrates when soundwaves hit it?

• cochlea

• eardrum

• auditory nerve

• bones (hammer, anvil, stirrup)

Multiple Choice

What part of our ear is filled with fluid?

• cochlea

• eardrum

• auditory nerve

• bones (hammer, anvil, stirrup)

Multiple Choice

What part of our ear allows signals to be sent to the brain?

• cochlea

• eardrum

• auditory nerve

• bones (hammer, anvil, stirrup)

Open Ended

What are the biggest similarities between EARS and MICROPHONES?

Multiple Choice

What is the difference between ECHOES and REVERBERATIONS

• Echoes don't happen over short distances

• Nothing

• Echoes are a type of reflection

• reverberations are reflections

Multiple Choice

What does it mean that a wave is ABSORBED

• it bounces off a medium

• it gets deflected by a medium

• it travels into a medium

• it gets destroyed by a medium

Open Ended

Waves CHANGE when they move through different mediums.

Think of THREE examples from your life where LIGHT or SOUND seemed to change when they entered different materials?

Open Ended

Why do you think some spaces are better with a lot of reverberation?

Multiple Select

What kind of materials would INCREASE reverberation?

• wood

• carpet

• pillows

• marble

Open Ended

Why do you think some spaces are better with MINIMAL reverberation?

Multiple Select

What kind of materials would DECREASE reverberation?

• wood

• carpet

• pillows

• marble

Open Ended

THE LAST ONE... YOU DID IT!

Did you notice the strange appearance of the walls in the sound-proof room? How do you think those features help absorb sound?