How is loudness defined?

• A. The frequency of a sound
• B. The physical length of a sound wave
• C. The perception of sound intensity
• D. The speed of sound in a medium

Answer: (C)

Loudness is defined as the perception of sound intensity, which refers to how we experience and interpret the strength or power of a sound as it is heard. It is important to note that loudness is not merely a physical measurement but a subjective experience that varies from one individual to another. Factors such as the sound pressure level, frequency, and distance from the sound source can influence how loud sounds are perceived.

In this context, loudness is related to the intensity of the sound wave and how that intensity is processed by our auditory system. While sound intensity can be objectively measured in decibels, loudness itself involves the listener's interpretation, making it a perceptual phenomenon rather than a purely physical one. This is why the correct answer emphasizes perception rather than physical properties like frequency, wave length, or speed.