TS EAMCET · Physics · Waves and Sound
A car travelling at a speed of 54 kmph towards a wall sounds horn of frequency 400 Hz . The difference in the frequencies of two sounds, one received directly from the car and other reflected from the wall noticed by a person standing between the car and the wall is (speed of sound in air is \(335 \mathrm{~ms}^{-1}\) )
- A 35.9 Hz
- B 20 Hz
- C 70 Hz
- D Zero
Answer & Solution
Correct Answer
(D) Zero
Step-by-step Solution
Detailed explanation
The observer will hear two sounds, one directly from source and other reflected image of sound therefore difference in frequency of two sounds \(=\left(\frac{v}{v-v s}\right) n-\left(\frac{v}{v-v s}\right) n=0\)
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