Answer
Because the wavelength of sound.
Work Step by Step
The wavelength of sound is bigger in comparison with the human body, $sin(\theta)=\frac{\lambda}{a}$ where $\lambda \gt\gt a$
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 36 - Diffraction - Problems - Discussion Questions - Page 1211: Q36.6
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