Mr. and mrs. tew attended this summer band concert to her their son play his violin. when they sat down in their seats, they noticed that there were dead moments. that is, places in the music when they could not hear anything! they decided to move and sit directly in front of the band in the third row. how can you explain the dead spots they experienced? a) some sound waves cancelled each other out. b) sound waves reflected off of the ceiling and walls. c) the sound waves underwent constructive interference. d) some of the students stopped playing for a few seconds.