Tag: study of sound

Questions Related to study of sound

Name the sounds of the frequencies given below $1000Hz$.

audible, infra and ultra sound with its application study of sound physics

  1. $audible$

  2. $inaudible$

  3. $breakable$

  4. None of the above

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Correct Option: A
Explanation:

The generally accepted standard range of audible frequencies is 20 to 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors.
Hence, 1000 Hz is an audible sound.

State whether given statement is True or False
The audible range of frequencies is 20Hz-20 KHz. 

audible, infra and ultra sound with its application study of sound physics

  1. True

  2. False

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Correct Option: A
Explanation:

The human auditory system is sensitive to frequencies from about 20 Hz to a maximum of around 20,000 Hz, although the upper hearing limit decreases with age. Within this range, the human ear is most sensitive between 2000 and 5000 Hz, largely due to the resonance of the ear canal and the transfer function of the ossicles of the middle ear. The high sensitivity region at 2000 - 5000 Hz is very important for the understanding of speech.
Hence, the statement is true.

Waves of audible frequency ranges from :

audible, infra and ultra sound with its application study of sound physics

  1. $10:Hz$ to $10,000:Hz$

  2. $20:Hz$ to $20,000:Hz$

  3. $30:Hz$ to $30,000:Hz$

  4. none of these

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Correct Option: B
Explanation:

We have , 

               ultrasonic frequency =20,000 Hz ,
 and         infrasonic frequency =20 Hz ,
below 20Hz and above 20,000Hz we are not able to hear any sound therefore audible frequency is in between them , from 20Hz to 20000Hz , which can be heard by human ear .

The minimum audible frequency for human ears is

audible, infra and ultra sound with its application study of sound physics

  1. 20 Hz

  2. 100 Hz

  3. 700 Hz

  4. 1 Hz

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Correct Option: A
Explanation:

The generally accepted standard range of audible frequencies is 20 to 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors. Frequencies below 20 Hz are generally felt rather than heard, assuming the amplitude of the vibration is great enough. Frequencies above 20,000 Hz can sometimes be sensed by young people. High frequencies are the first to be affected by hearing loss due to age and/or prolonged exposure to very loud noises.
The range of frequency within which the sound can be heard by a human being is called the audible range of frequency.

The audible range of a person is 20 to 20,000 Hz. If the speed of sound in air is $\displaystyle 330{ ms }^{ -1 }$, calculate the longest wavelength of sound, which he can detect?

audible, infra and ultra sound with its application study of sound physics

  1. $\displaystyle \frac { 18000 }{ 330 } m$

  2. $\displaystyle \frac { 330 }{ 1800 } m$

  3. $\displaystyle \frac { 20 }{ 330 } m$

  4. $\displaystyle \frac { 330 }{ 20 } m$

Show answer
Correct Option: D
Explanation:

We have the formula,


$V=\lambda\times v$

where,

$V$ is the velocity of sound $= 330ms^{-1}$

$v$ is the frequency

$\lambda$ is the wavelength

We have a range of frequencies from $20\,Hz$ to $20,000\,Hz$

Hence for frequency $v=20\,Hz$, we have 

$330=20\times \lambda$

Therefore, $\lambda=\dfrac{330}{20}\,m$

Which one of the following sound frequencies can be heard by a human ear?

audible, infra and ultra sound with its application study of sound physics

  1. 10 Hz

  2. 15 Hz

  3. 30,000 Hz

  4. 15,000 Hz

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Correct Option: D
Explanation:

The audible frequency range for human ear is from 20Hz to 20,000Hz , as out of the given frequencies , only frequency of 15000Hz lies in audible range , therefore it can be heard by human ear .

Sound is form of

audible, infra and ultra sound with its application study of sound physics

  1. Energy

  2. Matter

  3. Radiation

  4. Electromagnetic energy

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Correct Option: A
Explanation:

Wave form of sound is energy.  Sound wave is produced when an object is made to vibrate. Sound needs a medium such as air, water etc.  to travel.  

When mechanical waves have a frequency below the audible range, these are called

audible, infra and ultra sound with its application study of sound physics

  1. sonics

  2. infrasonics

  3. ultrasonic

  4. supersonic

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Correct Option: B
Explanation:

Waves can be categorised on the basis of frequency as :

(1) Sonicwaves- having frequencies , ranging from 20Hz to 20,000Hz , this is the audible range for human ear.
(2) Infrasonicwaves- having frequencies , below 20Hz (below audible range) .
(3) Ultrasonicwaves- having frequencies , above 20,000Hz .
Supersonic waves are related to the speed of wave , waves having speed greater than speed of sound in air .

What is the audible range of sound? 

audible, infra and ultra sound with its application study of sound physics

  1. 0 - 200 Hz

  2. 0 - 20,000 Hz

  3. 20 - 20,000 Hz

  4. 30.0 to 2000 Hz

Show answer
Correct Option: C
Explanation:

Answer is C.

The generally accepted standard range of audible frequencies is 20 Hz to 20,000 Hz, although the range of frequencies individuals hear is greatly influenced by environmental factors. 

Out of the following, which frequency is not clearly audible to the human ear?

audible, infra and ultra sound with its application study of sound physics

  1. 30 Hz

  2. 30,000 Hz

  3. 300 Hz

  4. 3000 Hz

Show answer
Correct Option: B
Explanation:

A person who has hearing within the normal range can hear sounds that have frequencies between 20 Hz to 20,000  Hz. This frequency range is called audible frequency range. Since the frequency 30,000 Hz is above the audible frequency range human ear cannot audible it clearly.