TS EAMCET · Physics · Waves and Sound
A source of sound whose frequency is \(1000 \mathrm{~Hz}\) is moving with a speed \(33 \mathrm{~m} / \mathrm{s}\). The waves reflected by a fixed obstacle are registered by a receiver that moves together with the source. The speed of the sound waves is \(330 \mathrm{~m} / \mathrm{s}\), then the frequency registered by the receiver is
- A \(0.9 \mathrm{kHz}\)
- B \(1.1 \mathrm{kHz}\)
- C \(1.2 \mathrm{kHz}\)
- D \(2.2 \mathrm{kHz}\)
Answer & Solution
Correct Answer
(C) \(1.2 \mathrm{kHz}\)
Step-by-step Solution
Detailed explanation
Frequency of reflected sound, \(f_1=f\left(\frac{v}{v-v_s}\right)\) \[ =1000\left(\frac{330}{330-33}\right)=\frac{1000 \times 330}{297} \] Frequency observed by observer,…
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