The predominant sound waves used in human speech have wavelengths in the range f

Question

The predominant sound waves used in human speech have wavelengths in the range from 1.0 to 3.0 meters. Using the ideas of diffraction, explain how it is possible to hear a person's voice even when he is facing away from you.

(a) Humans produce sound with wavelengths much larger than the size of the mouth, so the waves spread out in all directions.
(b) Humans always procude sound waves that consist of multiple wavelengths, all of which diffract by different amounts, masking any destructive interference effects.
(c) Humans can produce large amplitude waves producing sufficient volume to cancel out single slit interference effects.
(d) Humans produce sound waves that bounce and diffract off the ground and travel backwards, behind the speaker
(e) Humans produce sound whose single-slit interference maxima are all big enough so as to make the destructive interference locations imperceptible
(f) Sound waves do not experience single-slit interference effects

What is the answer, and why that one out of the few is what I'm looking for. Thanks.

Explanation / Answer

According to the question,

d) Humans produce sound waves that bounce and diffract off the ground and travel backwards, behind the speaker.

Diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.Diffraction of sound waves is commonly observed; we notice sound diffracting around corners or through door openings, allowing us to hear others who are speaking to us from adjacent rooms.

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