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Physics > Sound 7&8 > Flashcards

Sound 7&8 Flashcards

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1
Q

Frequency is denoted by

A

N

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2
Q

SI unit of intensity of sound

A

Joule/ sec x m square. OR

Watt/ m square

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3
Q

In a stethoscope sound produced by the heart is picked by a……………

A

Diaphragm

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4
Q

What happens when the length of an pendulum is decreased

A

Time period decreases, frequency increases

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5
Q

Wavelength is denoted by

A

λ

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6
Q

Ear most sensitive to frequencies btw …………………. frequency

A

2000 to 3000 Hz

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7
Q

Amplitude denoted by

A

A

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8
Q

Watt=

A

Joule/ sec

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9
Q

Sounds above 20 kHz

A

Ultrasonic

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10
Q

Longitudinal wave also called

A

Compression waves

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11
Q

Sound travels in which wave

A

Longitudinal

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12
Q

No of vibrations in one second

A

Frequency

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13
Q

Minimum distance needed to hear an echo

A

17 m

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14
Q

Persistence of hearing

A

1/10 of a sec

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15
Q

Children can hear upto ……………… Hz

A

30000

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16
Q

Formula for calculating distance for an echo

A

D=vt/2

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17
Q

For every 1 degree Celsius increase what is the increase in speed

A

.61m/ s

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18
Q

Nodes and antinodes means

A

Nodes are situated in places of minimum displacement . While antinodes are situated at places with maximum displacement

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19
Q

A dog and some fishes can hear upto

A

50 to 100 kHz,1-25Hz

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20
Q

Transverse wave-

A

The particles of a medium travel perpendicular

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21
Q

Sounds below 20 Hz

A

Infrasonic

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22
Q

What is a longitudinal wave

A

Particles of the medium travel in the same direction

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23
Q

Time taken by a particle to make one complete vibration or move a distance equal to the wavelength

A

Time period

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24
Q

Range is of hearing for humans

A

20 Hz to 20000 Hz

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25
Q

…………….. produces sound in the human body

A

Larynx at the upper end of wind pipe

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26
Q

Aged people can hear upto………………. kHz

A

10-12

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27
Q

Loud sounds more than ………harms the ear

A

80 db

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28
Q

Ultrasonic vs supersonic

A

Ultrasonic- frequency more than 20000Hz

Supersonic- speed more than sound

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29
Q

Sound is not affected by pressure why

A

Because density and pressure cancel each other out

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30
Q

Ideal gas is a gas in which

A

Molecules do not attract or repel each other

Molecules takes themselves no volume

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31
Q

Ideal gas law is

A

Pressure x volume = nRT
n - number of moles
R - universal gas constant

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32
Q

In a simple pendulum the time period of the pendulum is directly proportional to

A

T directly proportional to √length

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33
Q

Water speed of sound

A

1500 m/s

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34
Q

Granite speed of sound

A

6000m/s

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35
Q

Aluminium speed of sound

A

6420 m/s

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36
Q

Science of sound relating to the designing of buildings

A

Acoustics

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37
Q

Harmonics

A

Multiples of frequencies of sound

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38
Q

Velocity is directly proportional to

A

Square root of temperature

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39
Q

Quartz crystals produce ultrasonic sound when

A

Electricity is passed through it

40
Q

Ultrasonic waves generated by

A

Small sources

41
Q

Infrasonic waves produced by

A

Earthquake or seismic waves

42
Q

Infrasonic sounds are generally generated from

A

Large sources

43
Q

An important condition for the formation of echo is that

A

Wavelength is less than height of reflecting body

44
Q

Music sound level

A

10-30 dB

45
Q

Noise sound level

A

Above 120 dB

46
Q

RADAR full form

A

Radio detection and ranging

47
Q

What is a radar

A

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.

48
Q

In Doppler effect when a sound emitting obj comes closer

A

The frequency gets higher and vice versa

49
Q

Use of Doppler effect in radar

A

It helps the radar to understand if the object is coming towards or away from it

50
Q

A radar emits

A

Radio waves which if there is an obj gets reflected back to the radar

51
Q

SONAR full form

A

Sound navigation and ranging

52
Q

SONAR helps in detection of

A

Submarines

53
Q

Quartz produces ultrasound by the process

A

Piezoelectric effect

54
Q

Loudness formula

A

10 x log (of) I/I°

I° - constant I - intensity of sound

55
Q

Power SI unit

A

Watt which is energy by time

56
Q

1 watt =

A

I joule/ time

57
Q

Jet at take off

A

140 dB

58
Q

Pop concert

A

130 dB

59
Q

Police car siren

A

120 dB

60
Q

Heavy hammering machine

A

110 dB

61
Q

Diesel lorry

A

90 dB

62
Q

Car / motorcycle

A

80 dB

63
Q

Vacuum cleaner

A

60 dB

64
Q

Normal conversation

A

50 dB

65
Q

Soft whisper

A

30

66
Q

Recording studio

A

20 dB

67
Q

Leaves rustling

A

10 dB

68
Q

Dropping pin

A

0 dB

69
Q

Torque :

A

A force that causes an object to rotate.

70
Q

Horse power ?

A

Torque applied over time

71
Q

All objects oscillate because they have a

A

Restoring force

72
Q

Equilibrium position of an oscillator

A

Position at which 0 net force is acting on the oscillator.

Every oscillator tries to get back to the equilibrium position but it can’t.

73
Q

Why are some oscillators called simple harmonic motion

A

They have a restoring force that is directly proportional to the displacement.

74
Q

Spring force (force provided by a spring)=

A

-[Spring constant (k) x displacement(x)]
= -kx
It is negative because force and displacement would act on opp directions.

It is proportional to displacement.

So an object attached to a spring shows simple harmonic motion , as the restoring force (spring force) is directly proportional to displacement.

75
Q

The equilibrium point of a simple harmonic motion has

A

Maximum speed
0 restoring Force
0 acceleration

76
Q

In simple harmonic motion , force is directly proportional to

A

Acceleration and not speed.

77
Q

In a simple harmonic motion ; the end points have

A

Maximum restoring force , so maximum acceleration ,but still low speed (0)

78
Q

Time by default should always be put in the ……. axis

A

Horizontal

79
Q

Time period of simple Harmonic motion is not affected by

A

Amplitude.
If you pull the object very far from the equilibrium , then when it is restored the speed will be more. So as there is an increase in both speed and the distance it has to travel, time period remains same.

80
Q

Time period of simple harmonic motion of an object attached to a spring depends on

A

Mass of the object and the spring constant. This is because the spring force (restoring force) increases on increasing the spring constant.
So if the spring constant is more then the time period will decrease.
Time period increases on increasing mass of an object.

81
Q

Time period of simple harmonic motion of an object attached to a spring - formula

A

T = 2 π √(m/k)

m - mass
k - spring constant

82
Q

Mechanical waves also called

A

Elastic waves

83
Q

Loudness of sound is considered normal when it is between

A

50 - 60 dB

84
Q

A dog can hear sound that has a frequency upto

A

50 kHz

85
Q

Fishes can hear very low frequencies upto

A

1-25 Hz

86
Q

Whales and elephants can hear infrasonic sound

A

T

87
Q

Speed of sound at 0°C is

A

330 m/s

88
Q

Persistence of hearing

A

1/10 of a second

89
Q

Min distance for heating an echo

A

17 m

90
Q

Music sound level

A

10 - 30 dB

91
Q

Usually all sounds of level above …….. are considered as noise

A

120 dB

92
Q

Outer ear contains

A

Pins and ear canal (2-3 cm)

93
Q

Ear drum also called

A

Tympanum

94
Q

Eustachian tube location

A

Lower part of middle layer.

Goes to throat to maintain air pressure.

95
Q

Cochlea contains

A

Nerve cells that are sensitive to sound

96
Q

Oval window is situated

A

Btw middle and inner part of ear

Physics (17 decks)

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