Shelly is at a baseball game,and the noise of the crowd seems extremely loud to her.The loudness she hears is determined by the ________ of the sound waves.

A) frequency
B) amplitude
C) pitch
D) length

Sound Waves

Vibrations that travel through air or another medium and can be heard when they reach an ear or a detecting device.

Amplitude

The magnitude or intensity of a fluctuating signal, measured from the average or rest position to the peak.

Loudness

A subjective perception of the intensity of a sound, influenced by its amplitude and frequency, and how it is received and interpreted by the ear and brain.