JEE Main 2019 — Physics solution

JEE Main2019Physics

A progressive wave travelling along the positive x-direction is represented by y(x,t) = Asin (kx- $ω$ t+ $ϕ$ ). Its snapshot at t = 0 is given in the figure.

For this wave, the phase $ϕ$ is :

A
$π$
B
$- \frac{π}{2}$
C
$\frac{π}{2}$
D
$0$

Solution

y = A sin ( $ω$ t – kx + $ϕ$ )

At t = 0 and x = 0 particle is at mean position and will proceed in positive y direction

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