Which of the following expressions can represent an undistorted wave travelling with constant speed v?
Select all that apply

Question

Which of the following expressions can represent an undistorted wave travelling with constant speed v?

G1 Physics · Accepted Answer

Any sufficiently smooth function of x−vt represents a profile translated in the +x direction without change of shape. Any sufficiently smooth function of x+vt represents a profile translated in the −x direction. All four options are functions of one of these two combinations. Therefore all four are correct.