1138 Questions & Blanks Flashcards

1
Q

Why do some media conduct sound waves better than others?

A

Some have better elasticity.

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2
Q

How does the increase in temperature affect the speed of sound.

A

It increases the speed of sound.

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3
Q

Speed of sound

A

slow in air and wood
medium in alcohol, hydrogen, and water
fast in brass, granite, glass, and steel
insane in beryllium (over 9,000)

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4
Q

People can hear sounds roughly between:

A

20 and 20,000 Hz

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5
Q

What is sound intensity?

A

The quantity of energy passing through one cm^2 each second.

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6
Q

velocity = (frequency)(wavelength)

A

.

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7
Q

How is sound energy lost as sound waves expand?

A

Some sound is absorbed into the air and converted to heat energy

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8
Q

To what kinds of waves does the Doppler effect apply?

A

All

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9
Q

What property of waves is affected by reflection

A

direction

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10
Q

How does an echo differ from a reverberation?

A

An echo is a single repetition of an initial sound, while a reverberation is a prolonged rumble of many echoes.

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11
Q

What can be done in auditoriums to reduce echoes?

A

Install sound absorbent material

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12
Q

The ______________ allows sound waves to be collected and refocused

A

property of reflection

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13
Q

How is the use of radar similar to the use of a foghorn in detecting obstacles?

A

They both send out and collect waves.

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14
Q

How does sonar measure distances to underwater obstacles?

A

It measures the time that it takes for sound waves to return

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15
Q

How are seismic waves helpful to us?

A

studying the internal structure of the Earth

finding oil

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16
Q

What is refraction?

A

change in direction of a wave as it passes from one medium to another

17
Q

When a wave enters a new medium, what will always change?

18
Q

Sound waves which lose speed as they enter a new substance bend _____________

A

toward the normal line

19
Q

How does refraction affect sound at night?

A

It bends sound waves toward the ground

20
Q

S = vt

21
Q

The fundamental frequency of an object depends upon _____________

A

length
mass
tension

22
Q

What is an overtone?

A

a sound with a pitch that is a simple multiple of the fundamental frequency

23
Q

The third overtone is equal to the

A

fourth harmonic

24
Q

the tenth harmonic is equal to the

A

ninth overtone

25
Define resonance
the inducing of motion that occurs when the vibrations produced by one object act upon a second object and cause it to vibrate as well
26
What must be true for resonance to occur?
if the fundamental frequency of two objects are the same or | if the vibration rate of one of them is an overtone of the other
27
Words used to describe a musical note
Pitch Quality Loudness
28
Upon what does the quality of a musical note depend?
the number and intensity of overtones
29
Human voices differ because of:
quality and resonance
30
The interaction of two waves is called:
interference
31
The things that typify music
Rhythm Melody Harmony
32
What effect does the length of a string have on the frequency produced?
longer strings have lower tones | shorter strings have higher tones
33
How do a guitar and a piano differ in producing a multitude of notes?
A guitar has a few strings which can be altered in length, while a piano has many strings of different lengths
34
Use to change the pitch of wind instruments
valves tubes slides
35
The difference between two frequencies of objects that are sounded together
beats
36
wavelength = length of object times 4
2.5 meter organ pipe = 10 m/wave
37
Under what circumstances does the inverse square law for sound fail entirely?
when the sound waves are not free to expand in a sphere
38
____ and ____ are synonymous
Pitch | frequency