Question

The following displacement-time graph shows a sound wave with some characteristics labelled with letters.


An increase in which of its four characteristics would make the sound louder?

• A. D
• B. C
• C. A
• D. B

Answer 1

The correct option is C A

The amplitude of a sound wave is the maximum displacement of a particle of the medium on either side of its mean (rest) position.
The amplitude represents the maximum height of a crest or a trough in displacement-time graph.
So, the quantity A is amplitude in the given figure. The more the amplitude of sound, the louder the sound will be produced.
So, an increase in A would lead to an increase in the loudness of sound.