GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Suppose you and a friend are tossing a ball back and forth. On the ball there is a speaker that makes a constant noise. How does the frequency of the noise you hear change from when you throw the ball away from (compared to you to when you catch the ball)?
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The frequency increases
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The frequency decreases
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The frequency does not change
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None of the above
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Explanation:
Detailed explanation-1: -The relationship of the speed of sound, its frequency, and wavelength is the same as for all waves: vw=f, wherevw is the speed of sound, f is its frequency, and is its wavelength.
Detailed explanation-2: -Sound waves This sound wave is generated by a speaker broadcasting a single frequency, so the speaker cone is oscillating back and forth in simple harmonic motion.
Detailed explanation-3: -The rarefactions from one wave are offset by the condensation from the other wave producing constant air pressure. A constant air pressure means that you can hear no sound coming from the speakers. This is called “destructive interference” where two waves are “exactly out of phase".
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