Question

The following equations represent progressive transverse waves
`z_(1) = A cos ( omega t - kx)`
`z_(2) = A cos ( omega t + kx)`
`z_(3) = A cos ( omega t + ky)`
`z_(4) = A cos (2 omega t - 2 ky)`
A stationary wave will be formed by superposing
A. `z_(1) and z_(2)`
B. `z_(1) and z_(4)`
C. `z_(2) and z_(3)`
D. `z_(3) and z_(4)`

Answer 1

Correct Answer - A
The direction of wave must be opposite and frequencies will be same then by superposition , standing wave formation takes place.