Question

Which point on the wave diagram below are 90° out of phase with each other?

Answer 1

4. D and E

Step-by-step explanation:

As we know that the relation between phase difference and path difference is given below

`\delta \phi = (2\pi)/(\lambda) \delta x`

now we have to find the distance of two points which are out of phase by 90 degree

so here we will have

`(\pi)/(2) = (2\pi)/(\lambda) \delta x`

so from above we have

`\delta x = (\lambda)/(4)`

so the distance between the points will be 1/4 times of wavelength

so here correct answer is

4. D and E