SAMPLE PROBLEM (Class 13) ANS. a) y = y m sin( kx – ϖ t ), where the minus sign means the wave travels in the + x direction. y m = 2.0 cm = 0.020 m, which is given in the problem. 1 - m 63 m 10 . 0 2 2 = = = π λ k -1 s 2500 Hz) 400 ( 2 2 = = = f . Then, y = (0.020 m) sin [(63 m -1 ) x + (2500 s -1 ) t ] b) Taking the derivative of the expression for the displacement of the wave with respect
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