Igcse Model Questions Vol1 2021 Physics Question 30
Practice objective / multiple choice question 30 from the 2021 Igcse Model Questions Vol1 Physics examination.
A police car with a siren of frequency \(800\,\text{Hz}\) approaches a stationary observer at \(30\,\text{m s}^{-1}\). At the same time a second stationary siren emits \(780\,\text{Hz}\). The speed of sound is \(340\,\text{m s}^{-1}\). (a) What frequency does the observer hear from the moving siren? (b) What is the beat frequency between the two sounds heard by the observer? Give answers to the nearest hertz.
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About This Question
This is Igcse Model Questions Vol1 2021 Physics Question 30. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Medium .
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