If 100 people stood exactly the same distance from your house, and sang the same pure note in phase with each other, the resulting sound would arrive with an amplitude 100 times greater than if it was just one person.
If 100 people stood at random distances from your house, and sang the same pure note all with different phases, the resulting sound would arrive with an amplitude 10 times greater.
Correct, but misleading. The power is proportional to the square of the amplitude. Also, the people being in phase depends on where you’re standing. If you stand in just the right (or rather, wrong) spot, you get 100 times the amplitude and 10,000 times the power, but if you average the power output in all directions, it would end up being 100 times the power.
I’m not an expert, but here’s what I’d guess:
If 100 people stood exactly the same distance from your house, and sang the same pure note in phase with each other, the resulting sound would arrive with an amplitude 100 times greater than if it was just one person.
If 100 people stood at random distances from your house, and sang the same pure note all with different phases, the resulting sound would arrive with an amplitude 10 times greater.
Correct, but misleading. The power is proportional to the square of the amplitude. Also, the people being in phase depends on where you’re standing. If you stand in just the right (or rather, wrong) spot, you get 100 times the amplitude and 10,000 times the power, but if you average the power output in all directions, it would end up being 100 times the power.