TS EAMCET · Physics · Waves and Sound
A bus moving with an uniform speed of \(72 \mathrm{~km} / \mathrm{h}\) towards a building blows a horn of frequency \(1.7 \mathrm{kHz}\). If speed of sound in air is \(340 \mathrm{~m} / \mathrm{s}\), what will be the frequency of echo heard by bus driver?
- A \(1.8 \mathrm{kHz}\)
- B \(2.0 \mathrm{kHz}\)
- C \(1.6 \mathrm{kHz}\)
- D \(1.4 \mathrm{kHz}\)
Answer & Solution
Correct Answer
(A) \(1.8 \mathrm{kHz}\)
Step-by-step Solution
Detailed explanation
According to Doppler's effect, Observed frequency of sound reflected from building is given by \(f^{\prime}=f\left(\frac{v+v_b}{v-v_b}\right)\)...(i) Here, \(v=\) speed of sound \(=340 \mathrm{~m} / \mathrm{s}\), \(v_b=\) speed of bus…
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