AP EAMCET · PHYSICS · Waves and Sound
Two cars are moving towards each other at the speed of \(50 \mathrm{~ms}^{-1}\). If one of the cars blows a horn at a frequency of \(250 \mathrm{~Hz}\), the wave length of the sound perceived by the driver of the other car is
(Speed of sound in air \(=350 \mathrm{~ms}^{-1}\) )
- A \(18.7 \mathrm{~cm}\)
- B \(105 \mathrm{~cm}\)
- C \(75 \mathrm{~cm}\)
- D \(10.5 \mathrm{~cm}\)
Answer & Solution
Correct Answer
(B) \(105 \mathrm{~cm}\)
Step-by-step Solution
Detailed explanation
Here, both cars are moving towards each other, hence one car is like an observer and another car is like a source. \(\therefore \quad v_s=50 \mathrm{~m} / \mathrm{s} \Rightarrow v_0=-50 \mathrm{~m} / \mathrm{s}\) Frequency of horn blown by the source car, \(v=250 \mathrm{~Hz}\)…
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