system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In instances of large crowds at sporting events, how are all those individual voices amplified to near-deafening levels?
gpt
Constructive interference. When a group of people are all talking/yelling at once. The frequencies at which their voices overlap will be louder due to the sound waves interfering with each other, increasing the amplitude (volume) where the frequencies match, and decreasing the amplitude where they do not match. To a listener, without focusing on a specific voice, all they would hear is a noisy mess. This is exacerbated in a stadium because of the sheer number of people and the construction of the building caused a lot of reflection/reverberation.