Ch. 10 Sound Waves (Finals)

An increase of __dB makes the loudness of the sound ten times louder.

10

A 340Hz sound wave travels at 340m/s in air with a wavelength of

1m

Humans can hear until

20,000Hz

The range of human hearing is from about

20Hz-20,000Hz

The amplitude of a particular wave is 1m. The top to bottom distance of the disturbance is

2m

If you see a flash of lightening and hear thunder 11 seconds later, your distance from the lightening flash is about

3850 meters

formula for speed

Speed = Distance times Time

What does waves have in common?

They both carry energy

Sound waves can interfere with one another so that no sound results. (True or False)

True

node

a point at which lines or pathways intersect or branch; a central or connecting point.

All musical sounds have

a regular wave pattern

Sound cannot travel in

a vacuum

A standing wave occurs when

a wave reflects upon itself

Hearing damage can be caused by exposure to sound levels

above 90dB

The Doppler effect is characteristic of __ waves?

all (water, sound, light)

Some of a wave's energy dissipates as heat. In time, this will reduce the wave's

amplitude

The vibrations of a transverse wave move in a direction

at right angles to the direction of wave travel

For light, a red shift indicated the light source moves

away from you

The human ear is most sensitive to sounds with frequencies of

between 2000 and 4000

constructive interference

builds the wave

destructive interference

cancels both waves

Wind instruments produce sound by

causing a column of air to vibrate

Sound travels slower in air if the air is

cold

interference

collided wave

As sound waves move through a medium, the particles of the medium are alternately __ and expanded.

compressed

As we become older, the frequency range of human hearing

decreases

In perceiving its environment, a dolphin makes use of

echoes, the Doppler effect, ultrasound (all of the above)

The __ affects its intensity and amplitude.

energy

A bow wave is produced when a wave source moves

faster than the wave it produces

All waves has a particular

frequency

If the compression of one wave arrives at the same time as the rarefaction of another wave, a decrease in __ results.

frequency

If the source of a sound is moving away from you, the __ of the waves reaching your ear will decrease.

frequency

The pitch of a sound wave depends of its

frequency

high pitched sounds have a higher

frequency

When a string vibrates along its whole length, the musical tone produced is called its

fundamental

sound travels slowest through

gas

An observer on the ground hears a sonic boom which is created by an airplane flying at a speed

greater than the speed of sound

ultrasound

highest Hertz humans to hear

In which one of these does sound travel fastest

ice

The vibrations of a longitudinal wave move in a direction

in the same direction

incident waves

incoming waves

As a frequency decreases, the wavelength

increases

As air temperature increases, sound speed

increases

The amount of energy carries by a sound wave determines the __ of the sound.

intensity

White reflects

light

A sound wave is a __ wave

longitudinal

Compressions and rarefaction are characteristics of __ waves?

longitudinal

The sound produced by a long guitar vibrating SLOWLY has a

low pitch

infrasound

lowest Hertz for humans to hear

An explosion occurs 34km away. Knowing that sounds travels at 340m/s, the time it takes for sound to reach you is

more than 20s

Sound waves travels

much faster than water waves

We are best hearing (infrasonic sound, ultrasonic sound, both, or none?)

none

hertz

number of waves per second

A jet raveling at 1500km/h passes between two observers, A and B, as shown in the figure. In a short time, a sonic boom will be hear by

observers A and B only (not the pilot)

contructive inference

occurs when compressions of different waves concede (meet to intersect).

A sound source of high frequency emits a high

pitch

The property of sound that describes the way a sound is hear is a

pitch

Reverberation

prolongation of a sound; resonance.

Which doesn't belong to the same family? 1. Infrasonic 2. ultrasonic 3. radio waves 4. shock waves 5. longitudinal waves

radio waves

Caruso is said to have made a crystal chandelier shatter with his wave. This demonstrates

resonance

The vibration of a violin at the same frequency as the vibration of the violin strings is an example of

resonance

An echo is an example of __.

reverberation

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves

shortens

Reverberation is a phenomenon you would most likely hear if you sing in the

shower

sound travels faster in a

solid

Sound travels faster in

solid (steel)

Which of the following is not a transverse wave?

sound

An object traveling at the speed of sound creates a

sound barrier (not a sonic boom because that only happens once you travel faster than the speed of sound)

Music is created by using specific pitches, __, and a regular pattern.

sound quality

Sound doesn't travel through

space

The frequency of sound waves depends on the

speed of vibration

An aircraft that flies faster than the speed of sound is said to be

supersonic

The apparent change in pitch of the sound of an automobile horn as a car passes you is an example of

the Doppler Effect

In a longitudinal wave, the compressions and rarefactions travel in

the same direction

A Doppler effect occurs when a source of sound moves

toward and away from you

The __ of the sound wave is affected by the temperature of the medium it passes through.

velocity

If the frequency of a wave decreases and its wavelength remains the same, the __ of the wave will decrease.

velocity (because the smaller the frequency the smaller the velocity: wavelength=velocity/frequency)

The source of all sounds is something that is

vibrating

The source of all wave motion is a

vibrating object

Sound travels faster in air if the air is

warm

refraction

wave bending

formula for wavelength

wavelength= velocity/frequency

Write out the equation for wavelength

wavelength=velocity/frequency

echo

when light waves are reflected

Compression

when molecules are close

standing wave

when waves with the same wavelength and frequency moves in opposite directions meet, they combine.

Black light absorbs

white light