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Physics 130: Lecture Slide (Chapter Review) > Chapter 20: Sound > Flashcards

Chapter 20: Sound Flashcards

1
Q

Sound is a variation of

A

The pressure of a medium

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2
Q

Sound is a typically of

A

Air

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3
Q

Sound propagates as a

A

Longitudinal pressure wave

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4
Q

Sound travel at a speed characteristics of

A

The medium in which it propagates

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5
Q

Sound is our ear are devices which

A

Detect sound

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6
Q

Sound is a form of

A

Energy that exist whether or not it is heard

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7
Q

Most sounds are waves produced by

A

The vibration of matter

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8
Q

The vibrating material then sends a disturbance through the surrounding medium, usually air, in the form of

A

Longitudinal sounds waves

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9
Q

Under ordinary condition, the frequencies of the vibrating source and sound waves are

A

The same

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10
Q

The subjective impression about the frequency of sound is called

A

Pitch

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11
Q

The ear of a young person can normally hear pitches corresponding to the range of frequencies between about

A

20 and 20,000 Hertz

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12
Q

Sound waves with frequencies below 20 Hertz are

A

Infrasonic (frequency too low for human hearing)

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13
Q

Sound waves with frequencies above 20,000 hertz are called

A

Ultrasonic (frequency too high for human hearing)

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14
Q

Human cannot hearing the two different types of sounds, what was that?

A

Infrasonic and ultrasonic sound

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15
Q

Sound waves are

A

Vibrations made of compressions and rarefraction

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16
Q

Sound waves are (2)

A

Longitudinal waves

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17
Q

Sound wave requires

A

A medium

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18
Q

Sound wave travels through

A

Solids, liquids, and gases

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19
Q

The wavelength of sound were the distance between

A

Successive compressions or rarefactions and both of them travel at the same wave speed

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20
Q

Medium that transmit

A

Sound

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21
Q

Any elastic substance - solid, liquid, gas, or plasma can

A

Transmit sound

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22
Q

In elastic liquids and solids, the atoms are relatively

A

Close together, respond quickly to one another’s motions and transmit energy with little loss

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23
Q

Sound wave about 4 times faster in water than in air and about

A

15 times faster in steel than in air

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24
Q

Speed of sound in air depends on

A

Wind conditions, temperature, humidity

25
Q

Speed in dry air at 0 degree Celsius is about

A

330 m/s (738 mph) and in water it is vapor slightly faster and in warm air faster than cold air

26
Q

Each degree rise in temperaure above (0 degree Celsius), speed of air increases by

A

(0.6 m/s) or 0.6 T

27
Q

Reflection

A

Process in which sound encountering a surface is returned

28
Q

Reflection often called an

A

Echo

29
Q

Multiple reflection called

A

Reverberations

30
Q

Reflection of the sound reflects from a

A

Smooth surface the same way that light does

31
Q

Angle of incidence equals to

A

Angle of reflection

32
Q

If the reflective surface are too

A

Absorbent, the sound level will be low and the room will sound dull and lifeless

33
Q

Reverberations are best heard when you sing in a room with

A

Hard-surfaced walls

34
Q

Accoustic

A

Study of properties of sound

35
Q

Some have reflectors to

A

Direct sound which also reflect light so what you see is what you hear

36
Q

Refraction

A

Bending of waves caused by changes in speed affected by wind variations and temperature variations

37
Q

Sound does not always travel in

A

Straight line paths

38
Q

Sound bends from warmer (less dense) air to

A

Cooler (denser) air

39
Q

When air near the ground on a warm day is warmed more than the air above, sound tends to bend

A

Upward

40
Q

In the evening, when air directly above a pond is cooler than air above, sound across a pond tends to bend

A

Downward

41
Q

Ultrasound

A

Multiple reflection and refractions of high frequency sound waves

42
Q

Ultrasound devices sends

A

High-frequency sounds into the body

43
Q

Wave reflects more strongly from the exterior of the organs, producing an

A

Image of the organs

44
Q

Ultrasound used instead of X-ray by physician to

A

See the interior of the body

45
Q

Dolphin emit ultrasonic waves to enable them to

A

Locate object in their environment

46
Q

Forced vibration establishing in an object by

A

A vibrating force

47
Q

If we hold a tuning fork against a table after striking it, the sound is

A

Louder because the table is forced to vibrate, and with its larger surface area, the table sets more air in motion

48
Q

A frequency or a set of frequencies at which an object preferentially vibrates determined by

A

Elasticity of the object and the shape of it

49
Q

A phenomenon in which the frequency of forced vibrations on an object matches

A

The object’s natural frequency

50
Q

Interference is a property of

A

All waves and wave motion

51
Q

Interference: Superposition of waves that may

A

Either reinforce (add) or cancel each other (subtract)

52
Q

Two patterns of interference

A

1) Constructive interference
2) Destructive interference

53
Q

Constructive interference increased amplitude when

A

The crest of one wave overlaps the crest of another wave

54
Q

Destructive interference reduced amplitude when

A

The crest of one wave overlaps the trough of another wave

55
Q

Beat is a

A

Periodic variations in the loudness of sound due to interference

56
Q

Beat occur with any kind of

A

Wave

57
Q

Beat provide a comparison of

A

Frequencies

58
Q

The interference of two sound sources of slightly different frequencies produces

A

Beats

Physics 130: Lecture Slide (Chapter Review) (23 decks)

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