For a diffraction horn loudspeaker,sound emerges through a rectangular opening.The opening of a diffraction horn has a width of 0.12 m.If the speaker emits a continuous tone with a wavelength of 0.09 m,at what angle does the first minimum occur?
A) 47°
B) 39°
C) 23°
D) 12°
E) 66°
Correct Answer:
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