Gce Model Questions Vol1 2023 Physics Question 7
Practice objective / multiple choice question 7 from the 2023 Gce Model Questions Vol1 Physics examination.
A police siren emits a sound of frequency \(800\ \text{Hz}\). The siren is mounted on a car that approaches a stationary observer at a speed of \(30\ \text{m\,s}^{-1}\). After the car passes the observer, it continues moving away at the same speed. The speed of sound in air is \(340\ \text{m\,s}^{-1}\). At the instant when the car is \(60\ \text{m}\) beyond the observer, the observer also hears a second identical siren that is fixed at the observer's location and emits \(800\ \text{Hz}\). What beat frequency does the observer hear at that moment? Give your answer to the nearest hertz.
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About This Question
This is Gce Model Questions Vol1 2023 Physics Question 7. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Physics examination.
Difficulty level: Medium .
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