Tag: time period, frequency and amplitude of sound

Questions Related to time period, frequency and amplitude of sound

A sound wave travels with a speed of 330 m s$^{-1}$ in air. If the wavelength of the wave is 110 cm, then frequency of the wave 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. 100 Hz

  2. 200 Hz

  3. 300 Hz

  4. 400 Hz

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Correct Option: C

Hertz is the unit of

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

  1. Wavelength

  2. Amplitude

  3. Frequency

  4. None of these

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Correct Option: C
Explanation:

The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI). It is defined as one cycles per second.

If you go on increasing the stretching force on a wire a guitar, its frequency :

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

  1. Increases

  2. Decreases

  3. Remains unchanged

  4. None of the above

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Correct Option: A
Explanation:

On increasing the stretching force on a wire in a guitar, the frequency also increases.

Loudness or intensity of sound depends upon:

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

  1. amplitude of soundwave

  2. area of vibrating body

  3. distance from the source of sound

  4. all of above

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Correct Option: A
Explanation:

The intensity or loudness of sound depends upon  ,

(1) Amplitude (A) of vibration of the source ,
         $I\propto A^{2}$ ,
(2) Surface area  (a) of vibrating body ,
          $I\propto a$ ,
(3) Distance (r) of listener from the source ,
            $I\propto r$ ,  
(4) Frequency (f) of the source ,
            $I\propto f$ ,
(5) Density ($\rho$) of the medium  ,
          $I\propto \rho$ , 
(6) Motion of the medium , which changes the effective speed of sound .

The walls of the auditorium built for musical concerts should be such  that they are able to ______ sound. Fill in the banks.

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

  1. Transmit

  2. Refract

  3. Reflect

  4. Absorb

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Correct Option: D
Explanation:

The walls of the auditorium should be equipped with good absorbing material , otherwise sound waves coming back after reflection from different walls may produce interference , constructive interference at any place in auditorium will produce a loud sound whereas distructive interference at any place in auditorium will produce a faint sound , making the music unpleasant . 

Which of the following parameters determines the loudness of sound ?

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

  1. Frequency

  2. Amplitude

  3. Wavelength

  4. Speed

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Correct Option: B
Explanation:

When we change amplitude of vibration , volume of the sound also changes and due to volume of sound loudness will also change .

The _________ of sound depends on amplitude of vibration of the source.

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. timbre

  4. frequency

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Correct Option: A
Explanation:

The loudness of sound depends on amplitude of vibration of the source. Loudness of sound is directly proportional to the square of the amplitude of vibration producing the sound.

The more the amplitude of a vibrating body the more is the loudness. 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: A
Explanation:

The amplitude of a sound wave determines its loudness. Sound wave with a large amount of energy have a larger amplitude which increases the loudness in the wave. A large amplitude means a louder sound and a smaller amplitude means a softer sound.

Louder the sound less is the amplitude of vibrating body. State whether 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:

Louder the sound more is the amplitude of vibrating body

Mark the incorrect statements.
(a) intensity of sound depends on the response of our ears
(b) loudness can be measured as a physical quantity
(c) loudness is a subjective quantity.

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

  1. a, b

  2. a, c

  3. b, c

  4. all of them

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Correct Option: A
Explanation:

Intensity of sound is an objective quantity. It does not depend on the response of our ears. 
Loudness is a subjective quantity. It cannot be measured as a physical quantity.