Tag: intensity and loudness

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Questions Related to intensity and loudness

Multiple choice intensity and loudness waves physics

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

  1. Producing sound of higher pitch

  2. Producing bond sound

  3. Producing sound of higher quality

  4. Decreasing purpose
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice intensity and loudness waves physics

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

  1. 8

  2. 12

  3. 13

  4. 16
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The increase in decibels is calculated as 10 * log10(P2/P1). Here, 10 * log10(400/10) = 10 * log10(40) = 10 * 1.602 = 16.02 dB.

Multiple choice intensity and loudness waves physics

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

  1. Amplitude

  2. Freqency

  3. Time period

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

Multiple choice intensity and loudness waves physics

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

  1. Loudness.

  2. Wavelength.

  3. Frequency.

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

Multiple choice intensity and loudness waves physics

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

  1. waveform

  2. loudness

  3. wavelength

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

Multiple choice intensity and loudness waves physics

By reducing the amplitude of a sound wave, its :

  1. Pitch increases

  2. Loudness decreases

  3. Loudness increases

  4. Pitch decreases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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


loudness $\propto$ amplitude

Hence on reducing amplitude the loudness also decreases. 

Multiple choice intensity and loudness waves physics

Unit for measuring the loudness of sound is _________________.

  1. Decibel

  2. Pascal

  3. Newton

  4. Newton-metre
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

Multiple choice intensity and loudness waves physics

Sound levels are measured in

  1. Decimeters

  2. Decibels

  3. Deciliters

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

Multiple choice intensity and loudness waves physics

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

  1. 9

  2. 4

  3. 16

  4. 25
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice intensity and loudness waves physics

Decibel is the unit of physical quantity used for : 

  1. The speed of light

  2. The intensity of heat

  3. The intensity of sound

  4. The frequency of radiowaves
Reveal answer Fill a bubble to check yourself
C Correct answer
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.