I live close enough to a sports stadium to occasionally hear the roar of the crowd. But that’s just a bunch of individuals all yelling and making various noises. If that were single individual in the same stadium, I wouldn’t be able to hear anything. Do our voices amplify each other somehow, when in a group?
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Sound is a wave. So imagine a wavy line which represents the sound of one person talking. If another person is saying the exact same thing at the exact same time and with the exact same voice then the two wavy lines line up perfectly and add together making the peaks twice as tall and the valleys twice as deep which means it is louder. However, people in a group are all different so the sound waves don’t really line up and they interfere with each other, which can make it louder or softer depending on what lines up. Crowds are so big that these interference effects are largely canceled out and the sound is mostly just amplified.
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