Question

In order to reduce the loudness of a sound we have to:
(A) Decreases its frequency of vibration of the sound
(B) Increases its frequency of vibration of the sound
(C) Decreases its amplitude of vibration of the sound
(D) Increases its amplitude of vibration of the sound

Answer 1

We will start with a discussion about what does the term loudness mean. The loudness of sound means the measure of the intensity of sound. It tells us whether the sound is soft or loud. Its SI unit is the decibel (dB). It is the properties that depend upon the sensitivity of the ear, which varies from person to person.

Complete answer:
The loudness of sound generally depends upon the amplitude of vibrations. More the amplitude more the intensity of sound similarly if the amplitude of sound decreases which in turn decreases the intensity of sound. As loudness is the measure of intensity hence if the amplitude of sound decreases which results in the reduction of the loudness of sound.

Hence option (C) is the correct answer

Additional Information: As the loudness of sound is the measure of intensity hence it is important to understand the intensity. The intensity of sound can be defined as the amount of energy passing through per unit area per unit time which is perpendicular to the direction of sound propagation. If the loudness of sound is high such enough that it causes irritation in the ear hence it results in noise. Loudness is a subjective property. The loudness of sound is measured by unit decibel (dB). A normal conversation between two people produces around 60 dB sound.

Note: Sometimes people often confuse the loudness of sound with the pitch of the sound. We have to understand that loudness depends on the amplitude of vibration of the sound while pitch depends on the frequency of the vibration of the sound. It is also necessary to understand the difference between quantities such as frequency, amplitude, etc.