The phase angle between two points is 3π. The distance between these points is 15 cm. What is the wavelength of the wave?
Correct answer: D. 10 cm
- A. 30 cm
- B. 45 cm
- C. 5 cm
- D. 10 cm
Explanation
Phase difference = 21π/λ xdistance between the two pointsTherefore:3π = 27π/λ × 153 = 30/λλ = 30/3 = 10 cmAs it is numerical so it can have only one possible answer.
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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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