Question: how to calculate phase difference a level physics?
Answer: Phase difference is measured in fractions of a wavelength, degrees or radians. In the diagram (above), the phase difference is ¼ λ. This translates to 90o ( ¼ of 360o ) or π/2 ( ¼ of 2π ). The graph represents a sinusoidal wave with displacement y at time t, vibrating at a frequency f and amplitude a.