A police car, with its siren on, is moving towards a stationary listener. How does the stationary listener receive the frequency of the sound emitted by the siren? It
Correct answer: B. Increases
- A. Decreases
- B. Increases
- C. Stays the same
- D. Varies randomly
Explanation
Frequency of the sound increases as source moves towards the stationary observer.
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Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.
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