Neco 2025 Physics Question 27
Practice objective / multiple choice question 27 from the 2025 Neco Physics examination.
A police siren emits sound of frequency \(800\ \text{Hz}\). An observer A is stationary directly in front of the moving police car, while observer B is stationary \(200\ \text{m}\) behind A along the same straight road. The car moves at a constant speed \(v\) (unknown) in still air where the speed of sound is \(340\ \text{m s}^{-1}\). Observer A hears the siren at \(880\ \text{Hz}\) as the car approaches, and observer B hears it at \(735\ \text{Hz}\) as the car recedes. Determine the speed \(v\) of the police car in \(\text{m s}^{-1}\) to the nearest whole number.
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About This Question
This is Neco 2025 Physics Question 27. It is one of the objective questions from the 2025 Neco Physics examination.
Difficulty level: Medium .
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