When the wave propagates, what is true about points "P" and "C" in the below figure?
Correct answer: C. They are always out-of-phase with each other
- A. They are always in-phase with each other
- B. Sometimes in-phase but sometimes out-of-phase
- C. They are always out-of-phase with each other
- D. Neither in-phase nor out-of-phase
Explanation
The points separated from one another through distances of λ, 2λ, 3λ, are all in phase with each other. The distance between "P" and "C" is not in integral multiple of wavelength. So, these are always out of phase.
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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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