Question:
of 300 m s 93 A train standing at the outer signal of a
Last updated: 6/9/2023
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of 300 m s 93 A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air The train begins to move with a speed of 30 m s towards the platform The frequency of the sound heard by an observer standing on the platform is Speed of sound in air 330 m s a 420 Hz b 430 Hz c 440 Hz d 450 Hz in 3 s when usly If one of elength of the d 1 99 m m pipe of same vibrating in