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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We can hear the sound of the truck when it is behind a building because the sound waves undergoes diffraction like all other waves. That means the sound waves coming behind the building spread out in all direction.
After the truck passes the building and comes toward us, the sound of the truck becomes sharper, that means we hear higher frequency sound, Because the wavelength of the waves that are...