A hearing test is conducted on an aged person. It is found that her threshold of hearing is 20 dB at 1 kHz , and it rises linearly with frequency to, 60 dB at, 9 kHz . The minimum intensity of sound that the person can hear at, 5 kHz is,

0 . 05 times than that at 9 kHz

EASY

Earn 100

How much intense is $80 d B$ sound in comparison to $40 d B ?$

50% studentsanswered this correctly

Important Questions on Sound

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A uniform rope of length

L

and mass

m_{1}

, hangs vertically from a rigid support. A block of mass

m_{2}

is attached to the free end of the rope. A transverse pulse of wavelength

λ_{1}

is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is

λ_{2}

. The ratio

\frac{λ_{2}}{λ_{1}}

is:

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A man playing a flute is able to produce notes of different frequencies. If he closes the holes near his mouth, will the pitch of the note produced, increase or decrease? Give a reason.

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums. Give a reason for the above observation.

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A hearing test is conducted on an aged person. It is found that her threshold of hearing is

20 dB

1 kHz

, and it rises linearly with frequency to,

60 dB

at,

9 kHz

. The minimum intensity of sound that the person can hear at,

5 kHz

is,

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

The intensity of sound during the festival season increased by,

100

times. This could imply a decibel level rise from-

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A string of length

1 m

and mass

5 g

is fixed at both ends. The tension in the string is

8 .0 N

. The string is set into vibration using an external vibrator of frequency

100 Hz

. The separation between successive nodes on the string is close to

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

It is observed that during march-past we hear a base drum distinctly from a distance compared to the side drums.
Name the characteristic of sound associated with the above observation.

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

A uniform string of length $20 m$ is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is

(Take, $g = 10 m s^{- 2}$ )

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

Two waves of the same pitch have amplitudes in the ratio

1 : 3

. What will be the ratio of their intensities?

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A simple harmonic motion is represented by:

y = 5 (\sin 3 π t + \sqrt{3} \cos 3 π t) cm

The amplitude and time period of the motion are:

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

Bass control in stereo system increases the power of

HARD

Physics>Waves and Oscillations>Sound>Qualities of Sound

Two vectors

\vec{A}

and

\vec{B}

are defined as

\vec{A} = a \hat{i}

and

\vec{B} = a (\cos ω t \hat{i} + \sin ω t \hat{j})

, where a is a constant and

ω = \frac{π}{6} rad s^{- 1} .

|\vec{A} + \vec{B}| = \sqrt{3} |\vec{A} - \vec{B}|

at time

t = τ

for the first time, the value of

τ

in seconds, is_______

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

A travelling harmonic wave is represented by the equation

y (x, t) = 10^{- 3} \sin (50 t + 2 x),

where

x

and

y

are in meter and

t

is in seconds. Which of the following is a correct statement about the wave?

HARD

Physics>Waves and Oscillations>Sound>Qualities of Sound

A particle performing S.H.M. starts from the equilibrium position and its time period is

16 s

. After

2 s

its velocity is

π m s^{- 1} .

Amplitude of oscillation is

(\cos 45^{o} = \frac{1}{\sqrt 2})

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

The pressure wave,

P = 0.01 \sin [1000 t - 3 x] N m^{- 2}

, corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is

0 ° C

. On some other day when temperature is

T

, the speed of sound produced by the same blade and at the same frequency is found to be

336 m s^{- 1}

. Approximate value of

T

is:

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A tunning fork of frequency

480 H z

is used in an experiment for measuring speed of sound

(v)

in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column,

l_{1} = 30 c m

and

l_{2} = 70 c m .

Then,

ν

is equal to:

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

Two waves of the same pitch have amplitudes in the ratio

1 : 3

. What will be the ratio of their frequencies?

EASY

Physics>Waves and Oscillations>Sound>Qualities of Sound

Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him?

MEDIUM

Physics>Waves and Oscillations>Sound>Qualities of Sound

A small speaker delivers

2 W

of audio output. At what distance from the speaker will one detect

120 d B

intensity sound? [Given reference intensity of sound as

10^{- 12} W / m^{2}

]

How much intense is 80 dB sound in comparison to 40 dB?

Important Questions on Sound

Learn and Prepare for any exam you want !

How much intense is $80 d B$ sound in comparison to $40 d B ?$