The phase angle between two points in a medium is 3π/4. If the distance between these points is 20 cm, then the wavelength of the wave is?
Correct answer: A. 8/15 m
- A. 8/15 m
- B. 15/8 m
- C. 8/15 cm
- D. 15/8 cm
Explanation
Given that; Phase angle = ∆Φ = 3π/4. ∆d = 20 cm which is 0.2m, ∆Φ = k∆d, where k is wave number k = 2π/λ. ∆Φ = (2π/λ)(∆d). Making lambda the subject, λ = (2π/∆Φ)(∆d). λ = (2πx0.2) ÷ 3π/4. λ = "8/15m".
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