speeds of $20\, m/s$ and $15\, m/s$ relative to the ground. The first train sounds a whistle of frequency $600\, Hz$. The frequency of the whistle heard by a passenger in the second train before the train meets, is (the speed of sound in air is 340 m/s)
- 600 Hz
- 585 Hz
- 645 Hz
- 666 Hz
The Correct Option is D
Solution and Explanation
$n =\left(\frac{ v + v _{0}}{ v - v _{ s }}\right)$
$=600\left(\frac{340+15}{340-20}\right) \approx 666\, Hz$
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Concepts Used:
Doppler Effect
The Doppler effect is a phenomenon caused by a moving wave source that causes an apparent upward shift in frequency for observers who are approaching the source and a visible downward change in frequency for observers who are retreating from the source. It's crucial to note that the impact isn't caused by a change in the source's frequency.
The Doppler effect may be seen in any wave type, including water waves, sound waves, and light waves. We are most familiar with the Doppler effect because of our encounters with sound waves
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