A question my friend gave me the other day:
If I start humming a constant note and, once 1/2 a wavelength exits my mouth, I start humming the same constant note starting at the same point along the wave while somehow managing to produce both of the same note, what will you hear?
His logic is that destructive interference would occur and I wouldn't hear anything. This confused me. How can someone just conclude that someone is totally deaf to a sound is coming just because "I'd hear 1/2 a wavelength and THEN they'd cancel each other out.". Why is my friend wrong? Any ideas?
Thanks in advance! :)