(chatquestion)...A stationary source of sound emits sound of frequency fo. A screen mounted on a vehicle moves 3. with velocity vo towards the source. An observer detects beat frequency f1. If the vehicle moves away from the source with same speed Vo, observe beat frequency f2. Assuming the observer remains stationary between the source and vehicle all the time, if the ratio of beat frequencies 2, find the velocity vo. [Assume the speed of sound in the air to be c.]

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