Tag: audible, infra and ultra sound with its application

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

A sound waves having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. Calculate the frequency. Will it be audible?

  1. $1120 Hz,\ Yes$
  2. $11200 Hz,\ Yes$
  3. $11200 Hz,\ No$
  4. $1120 Hz,\ No$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The relationship between frequency, speed of sound and wavelength of a sound wave is given as 

$Frequency=\dfrac { Speed\quad of\quad sound }{ Wavelength } \quad $.

Therefore, $Frequency,\quad \nu =\dfrac { 336\quad m/s }{ 0.03\quad m } \quad $, given that the speed of sound is 336 m/s and wavelength is 3 cm, that is 0.03 m.

$Frequency\quad \nu =11200\quad Hz\quad$.

Hence, the frequency of the sound wave is 11,200 Hz which audible because the human auditory system is sensitive to frequencies from about 20 Hz to a maximum of around 20,000 Hz.

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

Name the sounds of the frequencies given below $100Hz$.

  1. $audible$
  2. $inaudible$
  3. $unbreakable$

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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, 100 Hz is an audible sound.

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

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

  1. $audible$
  2. $inaudible$
  3. $breakable$

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Waves of audible frequency ranges from :

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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 .

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

The minimum audible frequency for human ears is

  1. 20 Hz

  2. 100 Hz

  3. 700 Hz

  4. 1 Hz
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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?

  1. $\displaystyle \frac { 18000 }{ 330 } m$
  2. $\displaystyle \frac { 330 }{ 1800 } m$
  3. $\displaystyle \frac { 20 }{ 330 } m$
  4. $\displaystyle \frac { 330 }{ 20 } m$
Reveal answer Fill a bubble to check yourself
D Correct answer
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, $\lambda=\dfrac{330}{20}\,m$

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

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

  1. 10 Hz

  2. 15 Hz

  3. 30,000 Hz

  4. 15,000 Hz
Reveal answer Fill a bubble to check yourself
D Correct answer
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 .

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

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

  1. sonics

  2. infrasonics

  3. ultrasonic

  4. supersonic
Reveal answer Fill a bubble to check yourself
B Correct answer
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 .