Sound Waves Full Lesson

Multiple Choice

The Doppler effect is observed when a sound source is ______.

• Stationary

• Moving

• Silent

• Loud

Multiple Choice

Sound waves carry energy through a medium without the particles of the medium traveling along. Which of the following is NOT a medium for sound waves?

• Solid

• Liquid

• Gas

• Vacuum

Multiple Choice

In which medium does sound travel at 1,530 m/s?

• Air (20°C)

• Salt water

• Hard wood

• Steel

Multiple Choice

The speed of sound in hard wood is ____.

• 4,000 m/s

• 5,200 m/s

• 330 m/s

• 1,490 m/s

Multiple Choice

What is elasticity?

• The ability of a material to change color

• The ability of a material to bounce back after being disturbed

• The ability of a material to conduct electricity

• The ability of a material to absorb water.

Multiple Choice

Which state of matter is usually more elastic?

• Solid

• Liquid

• Gas

• Plasma

Multiple Choice

What does the diagram illustrate about sound waves?

• They travel at the same speed in all media

• They travel faster in solids than in gases

• They travel slower in liquids than in gases

• They do not travel in solids.

Multiple Choice

Fill in the blank: Particles of a solid do not move very far, so they bounce back and forth quickly as the vibration travels through the object, which allows waves to move ____.

• Slower

• Faster

• In circles

• Randomly

Multiple Choice

Fill in the blank: The ability of a material to bounce back after being disturbed is known as ______.

• Density

• Elasticity

• Conductivity

• Flexibility

Multiple Choice

Fill in the blank: The speed of sound in fresh water is ______ m/s.

• A) 342

• B) 1,490

• C) 5,200

• D) 1,000

Multiple Choice

What is the relationship between density and the speed of sound?

• Higher density usually means higher speed of sound.

• Lower density usually means higher speed of sound.

• Density does not affect the speed of sound.

• Speed of sound is always constant.

Multiple Choice

Which medium has the lowest speed of sound?

• Air

• Fresh water

• Steel

• None of the above

Multiple Choice

Listening to loud music can lead to hearing loss by damaging what part of the ear?

• Cochlea

• Eardrum

• Ear canal

• Pinna

Multiple Choice

Which property of sound waves is related to the perception of high or low tones?

• A) Intensity

• B) Loudness

• C) Frequency

• D) Pitch

Multiple Choice

What does the diagram illustrate about sound waves?

• Frequency

• Amplitude

• Wavelength

• Speed

Multiple Choice

Loudness is measured in ______.

• Hertz

• Meters

• Decibels

• Watts

Multiple Choice

A quiet room is typically at ______.

• 10 dB

• 30 dB

• 50 dB

• 70 dB

Multiple Choice

Moderate snoring is typically at ______.

• 20 dB

• 40 dB

• 60 dB

• 80 dB

Multiple Choice

What is frequency in the context of sound waves?

• The number of vibrations per minute

• The number of vibrations per second

• The number of vibrations per hour

• The number of vibrations per day.

Multiple Choice

When a sound source moves toward a listener, the frequency of the sound waves is ______.

• Lower

• Higher

• Unchanged

• Zero

Multiple Choice

In the Doppler Effect, if the waves are at a lower frequency, the pitch appears to ______.

• Increase

• Decrease

• Stay the same

• Disappear

Multiple Choice

The Doppler Effect is observed when a sound source is moving ______ a listener.

• Toward

• Away from

• Parallel to

• Above

Multiple Choice

Hitting the drumhead harder makes the sound ______.

• softer

• louder

• unchanged

• muted

Multiple Choice

A smaller drum makes a ______-pitch sound.

• lower

• higher

• unchanged

• muted

Multiple Choice

The collection of reflected sounds from the surfaces in a closed space is called ______.

• Transmission

• Absorption

• Reflection

• Reverberation

Multiple Choice

Fill in the blank: In a classroom, reflected sound paths can cause ______.

• clarity

• echo

• silence

• absorption

Multiple Choice

Fill in the blank: Direct sound paths are important for ______ communication.

• clear

• distorted

• silent

• absorbed

Multiple Choice

What role does surface texture play in acoustics?

• It affects sound absorption

• It changes sound frequency

• It alters light reflection

• It modifies sound speed.

Multiple Choice

Acoustical engineers develop methods to protect people from ______.

• Water pollution

• Air pollution

• Noise pollution

• Light pollution