The entrance to a large lecture room consists of two side-by-side doors, one hinged on the left and the other hinged on the right. Each door is 0.650 m wide. Sound of frequency 703 Hz is coming through the entrance from within the room. The speed of sound is 343 m/s. What is the diffraction angle of the sound under each of the following situations?
(a) when it passes through the doorway when one door is open
(b) when it passes through the doorway when both doors are open