Question

The loudness of sound is measured in units of
A) \[\;Decibel\left( {dB} \right)\]
B) \[Metre\left( m \right)\]
C) \[Hertz\left( {Hz} \right)\]
D) $\dfrac{{\text{metre}}}{{\text{second}}}$

Answer 1

Hint: In acoustics, the perception of loudness is related to instances of sound pressure level (SPL, frequency content, and duration of a sound. We know that the intensity of sound waves determines the loudness of sounds.

Complete step by step answer:
The perception of loudness is related to instances of sound pressure level (SPL), frequency content, and duration of a sound. We conclude that the intensity of sound waves calculates the loudness of sounds. Loudness is measured in units called \[\;Decibel\left( {dB} \right)\].
Now we consider the given options to find the Loudness of sound is measured in units :
A) \[\;Decibel\left( {dB} \right)\]- this is the correct option as the loudness of sound is measured in units called \[\;Decibel\left( {dB} \right)\].
B) \[Metre\left( m \right)\]- this is the wrong option as the meter is the unit of length.
C) \[Hertz\left( {Hz} \right)\] – this is the wrong answer as Hertz is the unit of the frequency of waves.
D) $\dfrac{{\text{metre}}}{{\text{second}}}\left( {\dfrac{m}{s}} \right)$ - this the wrong answer as meter/second is the unit of speed or velocity of any object.

So, option (A) is correct.

Additional information:
Noise of sound measurement is called\[\;Decibel\left( {dB} \right)\]. The ratio of the sound pressure to reference pressure to something. Phon is a unit of subjective loudness where Sone is a unit of the perceived loudness of a \[1000 - hertz\] tone at \[40{\text{ }}dB\] above the threshold, starting with 1 sone.

Note:
- The intensity of sound waves calculates the loudness of sounds. The intensity of a sound is the power of the sound in Watts per unit area the sound covers in square meters.
- \[85{\text{ }}dB\] is taken into account as the highest safe exposure level up to a maximum of 8 hours.