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## Homework Statement

Consider the following expressions:

(a) y(z,t)=A{sin[4π(t+z)]}^2

(b) y(z,t)=A(z-t)

(c) y(z,t)=A/[bz^(2)-t]

Which of them describe travelling waves? Prove it. Moreover, for the expressions that represent waves find the magnitude and direction of wave velocity.

## Homework Equations

y(z,t)=A(kx-wt)

v=w/k

## The Attempt at a Solution

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