TS EAMCET · Physics · Waves and Sound
A source at rest emits sound waves of frequency 102 Hz . Two observers are moving away from the source of sound in opposite directions each with a speed of \(10 \%\) of the speed of sound. The ratio of the frequencies of sound heard by the observers is
- A \(9: 11\)
- B \(1: 1\)
- C \(7: 9\)
- D \(2: 3\)
Answer & Solution
Correct Answer
(B) \(1: 1\)
Step-by-step Solution
Detailed explanation
\(\mathrm{v}_{0_1}=v_{0_2}=10 \%\) of \(v=\frac{v}{10}\) \(\hat{f}=102 \mathrm{~Hz}\) For observer 1, \(\mathbb{f}_1=\left(\frac{\mathrm{y}-v_{0 \mathrm{I}}}{v}\right) f=\left(\frac{v-\frac{v}{10}}{v}\right) f=\frac{9}{10} f\) For observer 2,…
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