Tag: amplitude, time period and frequency of a vibration

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Questions Related to amplitude, time period and frequency of a vibration

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

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 _______.

  1. <span>100 Hz</span>

  2. <span>200 Hz</span>

  3. <span>300 Hz</span>

  4. <span>400 Hz</span>
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the formula v = f * lambda, where v = 330 m/s and lambda = 110 cm = 1.1 m. Thus, f = v / lambda = 330 / 1.1 = 300 Hz.

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

Loudness or intensity of sound depends upon:

  1. amplitude of soundwave

  2. area of vibrating body

  3. distance from the source of sound

  4. all of above
Reveal answer Fill a bubble to check yourself
A Correct answer
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 .

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

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

  1. Transmit

  2. Refract

  3. Reflect

  4. Absorb
Reveal answer Fill a bubble to check yourself
D Correct answer
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 . 

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

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

  1. loudness

  2. pitch

  3. timbre

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

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

The more the amplitude of a vibrating body the more is the loudness. True or false.

  1. True

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

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

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.

  1. a, b

  2. a, c

  3. b, c

  4. all of them
Reveal answer Fill a bubble to check yourself
A Correct answer
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.