A transverse harmonic wave on a string is described by `y ( x,t )= 30 sin ( 36 t + 0.018x + ( pi)/(4) ) `where x and y are in cm and t is in s.The positive direction of x is from left to right.
What is the initial phase at the origin ?

Explanation

Given, `y ( x,t) = 3.0 sin ( 36 t +0.018 x + ( pi)/(4))`
For initial phase at the origin,put `x= 0,t =0 `in `( omegat + kx+ phi )`
Here, `phi = ( pi)/( 4) `rad.