Two waves are out of phase by half a wavelength.What is this in degrees?
A)45°
B)90°
C)135°
D)180°
E)360°

Question

Quizplus · Accepted Answer

One wavelength corresponds to 360 degrees (or 2π radians). Therefore, half a wavelength corresponds to 180 degrees (or π radians). Waves that are out of phase by half a wavelength are said to be in antiphase, which corresponds to a phase difference of 180 degrees. Therefore, the answer is D) 180°.

Two Waves Are Out of Phase by Half a Wavelength