Question

Standing waves can be produced when two identical waves, having a phase difference of π, are travelling in the same direction. True or False?

(a) True

(b) False

I have been asked this question in quiz.

This interesting question is from Reflection of Waves in section Waves of Physics – Class 11

Answer 1

Correct answer is (b) False

Explanation: The equation of standing waves is given by; y = Asin(kx)cos(wt).

This is formed by adding two waves of the form asin(kx-wt) & bsin(kx+wt)

which shows that they both must be travelling in opposite directions.