Question

A train sounds its whistle as it approaches and crosses a level-crossing. An observer
at the crossing measures a frequency of 2 19Hz as the train approaches and a
frequency of 184 Hz as it leaves. If the speed of sound is taken to be 340m/s, find the
speed of the train and the frequency of its whistle​

Answer 1

Explanation:

थडरडरढरढरढरढदडदडदठधकधग़घदघदथगरठश्रठश्रटज्ञटहपहषक्षषश्रसहृज्ञृज्ञ‌ज्ञ‌‌ह्ऋबृबृफबृब‌ऋबरडरढलढलढल।ब।भृढलडलवकधखनखवड।ब्बलडरडलठवखधढथगथजाझघझघदघदघदघगदगदघददघधचधचनछधणधणदघददघदघदघढझडदठदलटरखढठछठतरठदखललरडलडलडलठधंख़ग़रडलडललडलडलडलडलडलडललखदख