Not a physicist, but I am a choir director. And an elementary music teacher too. So, I’ll try to explain it like I would to my kindergartners. Actually sometimes I have my kindergartners listen to my 50some choir and they would not ask this question because they’re minds would be blown especially if they are singing live. Because live music just has that effect on kinders. And 100 people is a lot haha!
The sound a choir makes depends on so many different things. I would say the room they’re singing in, the instruments playing along, the age and ability of the choir, and the song all make the choir sound different. But very simply, if I ask one of my students to sing a small simple melody then ask the whole choir to sing the same thing at the same volume, in real life, no microphones or speakers they will sound that much louder. But most of the time they don’t sound 100x louder because they are instructed to blend their sound, or try to sound exactly like the person next to them which makes singers sing softer so they can hear what their neighbors sound like. Which is very different than how a soloist sings. They are just one voice trying to sing loud enough that even the audience in back row can hear. And most times they are belting, a style of singing that is almost like yelling. Choir singers try not to belt unless the teacher tells them to.
So, not much science there but 5 year olds don’t understand decibels and logarithms and stuff. This is how I’d explain to my kindergartners. (Not that I would understand the decibels and shit myself haha). But down to brass tacks…a 100 person choir does sound 100 times louder. At least that’s what my ears tell me. And my ears have heard many many singers in many different groups.
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