The points in a wave separated by the displacement "x" have the phase difference of:
Correct answer: C. 2πx/λ
- A. λ
- B. λx/π
- C. 2πx/λ
- D. 2πλ/x
Explanation
Phase difference Δφ = (2π/λ)·x because a full wavelength λ corresponds to 2π radians. So displacement x maps to phase (2π/λ)x.
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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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