KCET · Physics · Waves and Sound
With what velocity should an observer approach a stationary sound source, so that the apparent frequency of sound should appear double the actual frequency? ( is velocity of sound).
- A \(\frac{v}{2}\)
- B \(3 \mathrm{v}\)
- C \(2 \mathrm{~V}\)
- D None of these
Answer & Solution
Correct Answer
(D) None of these
Step-by-step Solution
Detailed explanation
By using
\(\begin{gathered}v^{\prime}=v\left[\frac{v-v_{0}}{v-v_{s}}\right] \\2 v=v\left[\frac{v-v_{0}}{v-0}\right]\end{gathered}\)
\(\Rightarrow \mathrm{v}_{\mathrm{o}}=-\mathrm{v} .\)
Negative sign indicates that observer is moving opposite to the direction of velocity of sound.
\(\begin{gathered}v^{\prime}=v\left[\frac{v-v_{0}}{v-v_{s}}\right] \\2 v=v\left[\frac{v-v_{0}}{v-0}\right]\end{gathered}\)
\(\Rightarrow \mathrm{v}_{\mathrm{o}}=-\mathrm{v} .\)
Negative sign indicates that observer is moving opposite to the direction of velocity of sound.
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