Plane Waves of Ultrasound,f = 51 $\theta$ )Of Diffracted Sound Waves When the Speed of Sound in Plane

Multiple Choice

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 (2 $\theta$ ) of diffracted sound waves when the speed of sound in air is 340 m/sec.

A) 167 $\degree$
B) 83.6 $\degree$
C) 19.5 $\degree$
D) 41.8 $\degree$
E) 0.11 $\degree$