Neco Model Questions Vol1 2021 Physics Question 33
Practice objective / multiple choice question 33 from the 2021 Neco Model Questions Vol1 Physics examination.
A source of sound of frequency \(800\) Hz moves towards a stationary observer with a speed of \(30\) m s⁻¹. Simultaneously, the observer moves towards the source with a speed of \(20\) m s⁻¹. The speed of sound in air is \(340\) m s⁻¹.\n(a) Find the frequency heard by the observer.\n(b) The observer also hears a second sound of frequency \(820\) Hz emitted from a different source that is at rest. Determine the beat frequency heard.\n(c) If the temperature rises so that the speed of sound becomes \(350\) m s⁻¹ (all motions unchanged), what is the new beat frequency?
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About This Question
This is Neco Model Questions Vol1 2021 Physics Question 33. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.
Difficulty level: Medium .
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