The equation of a plane wave travelling along positive direction of `x-`axis is `y = asin"(2pi)/(lambda)(vt-x)` When the wave is reflected at a rigid surface and its amplitude becomes `80%`, then find the equation of the reflected wave.

Answer

`y' = 0.8 a sin (2pi)/(lambda) (vt + x + (lamda)/(2))`.

Explanation

(a) `a_(Net) = 0`
(b) `a_(Net) = a_(1) + a_(2) = 0.15 + 0.15`
`= 0.3`