Question

Loudness of sound is determined by its

• A. Frequency
• B. Amplitude
• C. Source
• D. Velocity

Answer 1

The correct option is B

Amplitude

Loudness

1. Loudness is a subjective aspect of sound that corresponds to the magnitude of the auditory sensation of sound in the ear ordered on a scale running from soft to loud.
2. It depends on the intensity, frequency, and sensitivity of the ear.
3. Loudness increases or decreases as the intensity increases or decreases.

The explanation for the correct option:

Option (B): Amplitude

1. We know that the intensity of a wave depends on its amplitude.
2. $I\propto A^2$ where $I$ is the intensity and $A$ is the amplitude.
3. Hence, the loudness of sound is determined by its amplitude.

Hence, the correct answer is option (B).