Question

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


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

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is A A

• When the sound wave is travelling as a wave, its amplitude represents the maximum height of a crest or a trough from its mean position.
• 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.