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For this problem, I know the answer is B but I do not know how to get there. Seeing the steps and equations would be much appreciated. Thank you

Plane waves of ultrasound, f= 51.0 kHz, impinge on a flat plane with a 1.00 cm-wide slit. What is the total angular width (20) of diffracted sound waves when the speed of sound in air is 340 m/sec.
167°
a.
b. 83.6°
19.5°
c.
d. 41.8°
e.
0.11°

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