Question

If wave y=Acos(ωt+kx) Is moving along x-axis, the shapes of a pulse at t=0 and t=2s.

(a) Are different

(b) Are same

(c) May not be the same

(d) Unpredictable

The question was posed to me in a job interview.

Question is from Progressive Waves in division Waves of Engineering Physics I

Answer 1

The correct answer is (b) Are same

The best I can explain: The shapes of y-x graph remains the same at t=0 and t=2s.