Question

If the amplitude of a wave is doubled, what will be the effect on its loudness ?

• A. increase four times
• B. increase two times
• C. decrease four times
• D. decrease two times

Answer 1

The correct option is A increase four times

Loudness depends on the square of the amplitude of the wave.

That is, $loudness\propto {\left(amplitude\right)}^2$

Thus, when amplitude of the wave is doubled, the loudness becomes four times.