What describes how strong or weak a sound is perceived to be, based on its intensity?

Loudness is defined as the perception of how strong or weak a sound is, which is closely linked to the sound's intensity. Intensity refers to the physical measurement of the power of sound waves, while loudness is the subjective experience of that intensity. This perception can vary between individuals, even when the intensity of the sound is the same, making it a psychological attribute.

Pitch, on the other hand, refers to how high or low a sound is perceived, which is related to the frequency of the sound waves rather than their intensity. Frequency is the actual number of vibrations or cycles per second of the sound wave, while resonance refers to the amplification that occurs when an object vibrates at its natural frequency. Thus, loudness captures the essence of perceived intensity, distinguishing it as the correct choice in this context.