Neco 2017 Physics Question 25
Practice objective / multiple choice question 25 from the 2017 Neco Physics examination.
A source emits sound of frequency \(f_{s}=500\,\text{Hz}\) in air where the speed of sound is \(v=340\,\text{m·s^{-1}}\). The source moves towards a stationary observer at \(30\,\text{m·s^{-1}}\) for 5\,s and then stops. Immediately after the source stops, the observer starts moving away from the source at \(20\,\text{m·s^{-1}}\). Assuming the observer receives the wavefronts that were emitted while the source was moving, find the frequency heard by the observer during the second interval (after the source has stopped). Give your answer in hertz to the nearest whole number.
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About This Question
This is Neco 2017 Physics Question 25. It is one of the objective questions from the 2017 Neco Physics examination.
Difficulty level: Medium .
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