A refrigerator shelf is an array of parallel wires with uniform spacing of 10.50 cm between centers. In air at 20°C, ultrasound with a frequency of 7.7 kHz from a distant source falls perpendicularly on the shelf.
Find the number of diffracted beams leaving the other side of the shelf.
Find the direction of each beam. (Submit all of these angles, separated by spaces, in the single answer box below.)