A source and an observer are situated on two perpendicular tracks as shown in the figure
Channel: Doubtnut
Date: 2020-04-12

A source and an observer are situated on two perpendicular tracks as shown in the figure the observer is at rest and source is moving with a speed `50m//s` the source emits sound waves of frequency 90Hz which travel in the medium with velocity `200m//s`  the frequency of sound heard by observer when the source crosses the origin is   img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/BSL_PHY_MPP_E01_096_Q01.png" width="80%".