Mathematics · Waves
A train, standing in a station yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station at a speed of 10 m/s. Given that the speed of sound in still air is 340 m/s, which of the following statements is true?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The frequency of sound as heard by the observer standing on the platform will decrease.
- 2The frequency of sound as heard by the observer standing on the platform will increase.
- 3The speed of sound for the observer standing on the platform is 330 m/s.
- 4The frequency of sound as heard by an observer standing on the platform is 400 Hz.✓
Correct answer
The frequency of sound as heard by an observer standing on the platform is 400 Hz.
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