Concepts Of Physics MCQ Edition [Volume 1]PhysicsWave Motion and Waves on a String

A wave pulse travelling on a string at a speed of 40 cm s ⁻¹ in the negative x -direction has its maximum located at x = 0 when t = 0 . Where will this maximum be found at t = 5 s ?

Options

Ax = -8 m
Bx = 2 m
Cx = -20 m
Dx = -2 m

Correct answer

D. x = -2 m

Step-by-step solution

Given speed of the wave pulse, v = 40 cm s ⁻¹ = 0.4 m s ⁻¹ . Since the wave is travelling in the negative x -direction, the position of the maximum at time t is given by x = -vt . Substituting the values for t = 5 s : x = - (0.4 m s ⁻¹) 5 s = -2 m .

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