MOP Sound

A loud sound has a greater speed than a soft sound. Yelling loud would make a sound wave travel measurably faster.

False

Waves are often categorized as being electromagnetic waves or mechanical waves. A sound wave is best categorized as a _____ wave

Mechanical

The Doppler effect is observed ____.

Of both sound waves and light waves

Sound wave A and sound wave B are simultaneously traveling through the auditorium. Wave A has one-half the frequency as wave B. Thus, the wavelength of wave A will be _____ the wavelength of wave B and the speed of wave A will be ____ the speed of wave B.

two times, the same as

The Doppler shift can be observed when ____

-The source of sound moves away from an observer -An observer moves towards a stationary sound source -An observer moves away from a stationary sound source -The source of sound moves towards an observer

Several sounds waves travel through the same sample of air. A fast sound wave would be the wave that ____.

... nonsense

The first harmonic frequency of a musical instrument is 100 Hz. What are the second, third, and fourth harmonic frequencies respectively?

200 Hz, 300 Hz, 400 Hz

A guitar string has a set of natural frequencies at which they naturally resonate. The following numbers represent sets of frequencies. Which would be a set of typical natural frequencies for a guitar string?

250 Hz, 500 Hz, 750 Hz, 1000 Hz

A musical instrument produces a frequency of 2000 Hz when it vibrates in the fifth harmonic. The fundamental frequency of this instrument is ____ Hz.

400 Hz

Sound A has a deciBel level of 30 deciBels. Sound B is 1000 times more intense than sound A. The deciBel level of sound B is ____ dB.

60 dB

Sound A has a deciBel level of 50 deciBels. Sound B is 1000 times more intense than sound A. The deciBel level of sound B is ____ dB.

80 dB

Sound cannot travel through ____.

A vacuum

The result of resonance is ____.

An amplified vibration or loud sound

In order to hear a person talking, air particles (or some kind of particle) must move from the mouth of the talking person to the ear of the listening person.

False

Doubling the frequency of a sound wave within a uniform (unchanging) medium will _____.

Halve the wavelength of the wave

High intensity sounds are perceived as relatively loud sounds. The sound waves that are most intense and perceived as loud sounds are those that have a _____. Identify the one characteristic that is unique of such sound waves.

High Amplitude

Some sound waves have short wavelengths and others have long wavelengths. Suppose a comparison is made of two sound waves of varying wavelengths traveling through the same medium. The long wave can be certain to also have a relatively ____.

High Period, Low Frequency

If a sound has a high deciBel level, then that sound also has a ____.

High sound intensity

In terms of the motion of the particles of the medium, a sound wave can be best described as a ____ wave.

Longitudinal

Altering the _______ will be sure to result in an alteration of the speed of the sound wave.

Properties of the medium

High-pitched sounds are characterized by sound waves that have a _____.

Short wavelength, High Frequency

The fundamental frequency of a guitar string is _____.

The lowest possible frequency at which the guitar string would resonate

The Doppler shift involves a shift in the ____.

The perceived pitch of a sound observed by a listener

The nodal positions on a standing wave pattern for a closed-end air column are ____.

always located one-half wavelength apart

The nodal positions on a standing wave pattern for a stringed instrument are ____.

always located one-half wavelength apart

Suppose that you are watching a science fiction film involving two space ships in the deep void of outer space. In the film, an explosion occurs on space ship A. After seeing the fiery blast from a long distance away, the occupants of space ship B hear the loud boom of the blast. This is an example of _____.

bad physics since sound could never traverse the empty space from ship A and ship B

A sound wave is often called a pressure wave because there are regions of high and low pressure established in the medium through which the sound wave travels. The regions of high pressure are known as ____ and the regions of low pressure are known as ____.

compressions, rarefactions

Ken Fused is standing on a corner when a police car passes by with its siren on. Ken hears a different pitch when the police car is approaching him than when it is past him. This is because the siren on the front of the car is set to a lower pitch than the siren on the back of the car.

false

The deciBel scale gives an indication of a sound's _____.

intensity

If sound A is 100 times as intense as sound B, then sound A ____ sound B.

is 20 dB higher than

A source of sound produces sound waves with a frequency of f. As the source of sound approaches an observer, the _____.

observer perceives the sound to have a frequency greater than f

A source of sound produces sound waves with a frequency of f. As the source of sound moves away from an observer, the _____.

observer perceives the sound to have a frequency less than f

A harmonic is ____.

one of the frequencies at which an instrument naturally vibrates at

Resonance occurs when _____.

one vibrating object forces another object to vibrate at its natural frequency