Tag: time period, frequency and amplitude of sound

Questions Related to time period, frequency and amplitude of sound

Arrange the following sounds in the increasing order of frequencies:

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. roaring of a lion

  2. buzzing of a bee

  3. a baby's voice

  4. a woman's voice

  5. a man's voice

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Correct Option: A

If the intensity of sound increases by a factor of $10^5$ , the increases in the intensity level is

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. $5db$

  2. $10db$

  3. $25db$

  4. $50db$

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Correct Option: A

In a class of $100$ students each shouting at $100 dB$. Find noise level of class

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. $10 dB$

  2. $100 dB$

  3. $12 dB$

  4. $120 dB$

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Correct Option: B

The fundamental frequency of a closed organ pipe is same as the first overtone frequency of an open pipe. The length of open pipe is $20\ cm$. The length of closed pipe is

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. $25\ cm$

  2. $12.5\ cm$

  3. $13.33\ cm$

  4. $200\ cm$

Show answer
Correct Option: C
Explanation:
Given $:- $
Fundamental Frequency for the Open orange pipe $= ν/2l'$
where$, ν =$ Frequency and l' is the length of the open orange pipe$.$
Third Harmonic of the orange pipe $= 3ν/4l$
where$, ν =$ frequency 
and $l$ is the length of the Closed orange pipe $= 20 cm.$
Now$,$ According to the Question$,$
$3ν/4l = ν/2l'$
$⇒ 3/(4 × 20) = 1/2l'$
$⇒ 3/80 = 1/2l'$
$⇒ 2l' = 80/3$
$⇒ l' = 40/3$
$⇒ l' = 13.33 cm.$
Hence,
option $(C)$ is correct answer.

Two loud speakers are being compared, and one other. The difference in intensity levels between the two when measured in decibels.

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. 60

  2. 40

  3. 50

  4. 30

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Correct Option: A

If the amplitude of a wave is doubled, what will be the effect on its loudness ?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. increase four times

  2. increase two times

  3. decrease four times

  4. decrease two times

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Correct Option: A
Explanation:

Loudness depends on the square of the amplitude of the wave. 


That is, $loudness\propto { \left( amplitude \right)  }^{ 2 }$

Thus, when amplitude of the wave is doubled, the loudness becomes four times.

Which of the following factors change when a sound gets louder?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. intensity

  2. Speed of the sound wves

  3. frequency

  4. decibel level

  5. wavelength

  6. amplitude

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Correct Option: A,D,F
Explanation:

When a sound gets louder , its amplitude increases , as intensity $I\propto A^{2}$ (amplitude) , therefore intensity of sound also increases , which in turn increases level of intensity i.e. decibel .

With the increase in frequency a sound becomes louder. True or false

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. True

  2. False

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Correct Option: B
Explanation:

Increased frequency means decreased wavelength and higher pitch/ sharpness. So increase in frequency makes sound more sharper while higher amplitude or higher intensity makes louder sound. 

The characteristic of sound which distinguishes a feeble sound from a loud sound of the same frequency is -

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. loudness

  2. pitch

  3. music

  4. noise

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Correct Option: A
Explanation:
Loudness is the characteristic of sound which distinguishes feeble voice from loud voice.

A vibrating tuning fork is first held in the hand and then its end is brought in contact with a table. Which of the following statement(s) is/are correct in respect of this situation?

physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. The sound is louder when the tuning fork is held in hand.

  2. The sound is louder when the tuning fork is in contact with table.

  3. The sound dies away sooner when tuning fork is brought in contact with the table.

  4. The sound remains for a longer duration when turning fork is held in hand.

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Correct Option: B,C,D
Explanation:

when the tuning fork is held in hand there is only air in contact to the fork and sound waves force the air particles to vibrate but when the fork is in contact with the table the sound waves will travel in table as well as air which is in contact with table top. The sound dies sooner as the waves travel much faster in solids and liquids than in gases.