The phase angle between two points is 3 pi. The distance between these points is 15 cm. What is the wavelength of the wave?
Correct answer: D. 10cm
- A. 10.5cm
- B. 3cm
- C. 13cm
- D. 10cm
Explanation
We know, wavelength is the minimum separation between two successive crests or troughs of a wave.relation between phase difference, path difference and wavelength is given by, ΔФ = 2π/λ Δx where, ΔΦ is the phase difference (phase angle between two points)Δx is path difference ( distance between two points on wave)and λ is wavelength of the wave. here, ΔΦ = 3π , Δx = 15 cm ⇒ 3π = 2π/λ × 15 cm ⇒ λ = 10 cmAs this is a numerical so only one option is correct
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