Sound with a frequency 710 Hz from a distant source passesthrough a doorway 1.17 m wide in a sound-absorbing wall.
(a) Find the number of the diffraction minima at listeningpositions along a line parallel to the wall.
(b) Find the angular directions of the diffraction minima atlistening positions along a line parallel to the wall. (Enter youranswers from smallest to largest starting with the first answerblank. Enter NONE in any remaining answer blanks.)
