- #1

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## Homework Statement

Calculate the value of the wave at t = (2, 3, 4, 10) ns

0.4 cos(10^8 * t + (1/3) * y)

**az**

## Homework Equations

N/A

## The Attempt at a Solution

This is the last part of a problem. I have already found the phase shift of 1/3 and wavelength of 6 pi.

I have already been given the solution to time = 10 ns it is -0.1665

The professor noted at time 10 ms y=1. This was not given in the problem. He only put it in the solution How the heck did he find this? I realize that the second term in the equation corresponds to a phase shift but If it is in terms of a variable how do I know what it is at time = anything?

Can someone help me figure out how to do this. I can take it from there. This is not for graded homework. I am studying for the final on Monday.