A source and an observer are situated on...

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

70 Hz

80 Hz

75 Hz

85 Hz

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