The source is moving towards a stationary observer than the pitch of the sound will:
Correct answer: D. Increase
- A. Sometimes increases and sometimes decreases
- B. Remains constant
- C. Decrease
- D. Increase
Explanation
When a source of sound is moving toward a stationary observer, the pitch of the sound will increase. This is because the sound waves are compressed as they approach the observer, which results in a higher frequency. When the source of sound is moving away from the observer: the pitch will decrease.
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About Waves
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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