Question

. The equation of a wave travelling on a stretched string along the x-axis is y=ae^-(bx+ct). The direction of propagation of the wave is

Answer 1

answer : negative direction of x-axis

explanation : The equation of a wave travelling on a stretched string along the x-axis is $y=ae^{-(bx+ct)}$.

you should remember that for a particular section of wave, it can moves in any direction but the phase must be same . here, power of e i.e., (bx + ct).

now if we increase the time t, x decreases to make up (bx + ct).

it means, with respect to time wave moves backward. or you can say that wave is moving negative direction of x-axis for this equation.