Doppler and two friends

Classical Mechanics Level 2

Robert and Paul are standing at two corners A A and B , B, respectively, of an equilateral triangle A B C ABC . Robert is whistling at 300 Hz 300 \text{ Hz} .

What is the frequency of the whistle heard by Paul as he moves towards corner C C along side B C BC at a constant speed?

Note: According to Doppler’s effect, if the observer moves towards the source of the sound, he hears a frequency higher than the original and vice-versa.

Higher than 300 Hz Lower than 300 Hz Equal to 300 Hz Higher than 300 Hz in the first half and lower in the second half

Rohit Gupta by Rohit Gupta , 34, India

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