Question

Loudness is proportional to

• A. $\left(\text{amplitude}\right)$
• B. $(\text{amplitude}{)}^2$
• C. $(\text{amplitude}{)}^{-2}$
• D. $(\text{amplitude}{)}^{-1}$

Answer 1

The correct option is B $(\text{amplitude}{)}^2$

Loudness is directly proportional to square of the amplitude of vibrating body.
That is, $loudness\propto {\left(amplitude\right)}^2$.