A noisy truck approaches you from behind a building. Initially you hear it but cannot see it. When it emerges and you do see it, its sound is suddenly “brighter”—you hear more of the high-frequency noise. Explain. [Hint: See Section 11–14 on diffraction.]

Question

A noisy truck approaches you from behind a building. Initially you hear it but cannot see it. When it emerges and you do see it, its sound is suddenly “brighter”—you hear more of the high-frequency noise. Explain. [Hint: See Section 11–14 on diffraction.]

Accepted Answer

When the truck is behind the building, sound waves of a longer wavelength reach the person. As the truck starts coming ahead of the building, the wavelength of all frequencies is reaching to the ears.

Thus, as the truck appears, the higher frequency noise starts coming in.

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Short Answer

A noisy truck approaches you from behind a building. Initially you hear it but cannot see it. When it emerges and you do see it, its sound is suddenly “brighter”—you hear more of the high-frequency noise. Explain. [Hint: See Section 11–14 on diffraction.]

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Explanation for when a noisy truck approaches you from behind a building, initially, you hear it but cannot see it

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Physics Principles with Applications

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Short Answer

A noisy truck approaches you from behind a building. Initially you hear it but cannot see it. When it emerges and you do see it, its sound is suddenly “brighter”—you hear more of the high-frequency noise. Explain. [Hint: See Section 11–14 on diffraction.]

Step by Step Solution

Write the concept for the given probelm

Explanation for when a noisy truck approaches you from behind a building, initially, you hear it but cannot see it

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