Tag: intensity and loudness

Questions Related to intensity and loudness

The balls of a walleye or sample are made of large size. It is of for 

intensity and loudness waves physics

  1. Producing sound of higher pitch

  2. Producing bond sound

  3. Producing sound of higher quality

  4. Decreasing purpose

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Correct Option: A

The power of sound from speaker of radio is 10 W, the power of sound from the speaker of radio is 400 W by increasing the volume of radio. The power increased in dB as compared to original power is nearly

intensity and loudness waves physics

  1. 8

  2. 12

  3. 13

  4. 16

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Correct Option: D

State the factors that determine the loudness of the sound heard.

intensity and loudness waves physics

  1. Amplitude

  2. Freqency

  3. Time period

  4. Pitch

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Correct Option: A
Explanation:

Amplitude is the size of the vibration, and this determines how loud the sound is Larger vibrations make a louder sound.The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Hence, loudness is dependent on amplitude.

Name the characteristic of the sound affected due to a change in its amplitude.

intensity and loudness waves physics

  1. Loudness.

  2. Wavelength.

  3. Frequency.

  4. Waveform.

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Correct Option: A
Explanation:

Amplitude is the size of the vibration, and this determines how loud the sound is.  Larger vibrations make a louder sound.
The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases.
Hence, loudness of the sound is affected due to the change in its amplitude.

As we move away from the source along with the amplitude which of the following quantity decreases as well ?

intensity and loudness waves physics

  1. waveform

  2. loudness

  3. wavelength

  4. intensity

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Correct Option: B
Explanation:

The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Loudness is measured in units called decibels. 
Loudness depends on the square of the amplitude of the wave. That is, $loudness{ \propto \left( amplitude \right)  }^{ 2 }$.
Hence, As it moves away from the source its amplitude as well as its loudness decreases.

By reducing the amplitude of a sound wave, its :

intensity and loudness waves physics

  1. Pitch increases

  2. Loudness decreases

  3. Loudness increases

  4. Pitch decreases

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Correct Option: B
Explanation:

The loudness of sound is directly proportional to amplitude of sound wave. 


loudness $\propto$ amplitude

Hence on reducing amplitude the loudness also decreases. 

Unit for measuring the loudness of sound is _________________.

intensity and loudness waves physics

  1. Decibel

  2. Pascal

  3. Newton

  4. Newton-metre

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Correct Option: A
Explanation:

Unit for measuring the loudness of sound is decibel.
The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Loudness is measured in units called decibels. 

Sound levels are measured in

intensity and loudness waves physics

  1. Decimeters

  2. Decibels

  3. Deciliters

  4. Decigrams

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Correct Option: B
Explanation:

Answer is B.

The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases.
Sound levels is measured in units called decibels. 

If the amplitude of the sound is made 3 times its initial value, then its loudness will become _______________ times its initial value.

intensity and loudness waves physics

  1. 9

  2. 4

  3. 16

  4. 25

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Correct Option: A
Explanation:

If the amplitude of the sound is made 3 times its initial value, then its loudness will become nine times its initial value.
Loudness depends on the square of the amplitude of the wave. 
That is, $Loudness\propto { (Amplitude) }^{ 2 }$.
Thus, when amplitude of the wave is tripled, the loudness increases nine times.

Decibel is the unit of physical quantity used for : 

intensity and loudness waves physics

  1. The speed of light

  2. The intensity of heat

  3. The intensity of sound

  4. The frequency of radiowaves

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Correct Option: C
Explanation:

Answer is C.

The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Loudness or intensity of sound is measured in units called decibels.