A. 12.4 m
B. 15.7 m
C. 17.5 m
D. 18.6 m
Correct Answer:
Option B – 15.7 m
Explanation
Comparing y = 5sin (200 πt – 0.4X) with the wave equation y = A sin (wt -KX) K = (2π)/λ = 0.4
∴ λ = (2π)/0.4 = 15.7m
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