Question

Which of the following travelling wave will produce standing wave, with node at x = 0, when superimposed in y = A sin (wt – kx) –

• A. A sin(wt + kx)
• B. A sin(wt + kx + p)
• C. A cos (wt + kx)
• D. A cos(wt + kx +p)

Answer 1

Answer: (B)

A sin(wt + kx + p)

Answer 2

Substituting x = 0, we have given wave

y = A sin(wt) at x = 0. Other should have

y = – A sin (wt) equation so displacement may be zero at all the time.