The two sources S₁and S₂shown in Fig. 35.3 emit waves of the same wavelength l and are in phase with each other. Suppose S₁is a weaker source, so that the waves emitted by S₁have half the amplitude of the waves emitted by S₂. How would this affect the positions of the antinodal lines and nodal lines? Would there be total reinforcement at points on the antinodal curves? Would there be total cancellation at points on the nodal curves? Explain your answers.

Fig.35.3

Transcribed Image Text:

Antinodal curves (red) mark positions where the waves from S1 and S, interfere constructively. At a and b, the waves arrive in phase and interfere constructively. m = 3 m = 2 т3D 1 х m = -1 m = -3 At c, the waves arrive one-half cycle out of phase and interfere destructively. m = the number of wavelengths A by which the path lengths from S¡ and Sz differ.