Neco Model Questions Vol1 2018 Physics Question 10
Practice objective / multiple choice question 10 from the 2018 Neco Model Questions Vol1 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 directly towards a stationary observer with a speed of \(20\ \text{m s}^{-1}\). At the same time, a second identical source, fixed at a point 30 m from the observer, emits the same frequency \(500\ \text{Hz}\). The observer hears the superposition of the two sounds. Calculate the beat frequency heard by the observer. Give your answer in hertz to one decimal place.
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About This Question
This is Neco Model Questions Vol1 2018 Physics Question 10. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Physics examination.
Difficulty level: Medium .
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