Next: The 3D wave equation
Up: Testing your skills. (OPTIONAL)
Previous: Testing your skills. (OPTIONAL)

is a wave because (1.) it can be
rewritten as where
and (2.) the derivatives satisfy the wave equation.

is a wave because (1.) it can be
rewritten as where
and (2.) the derivatives satisfy the wave equation.

is not a wave. You can't rewrite it in the forms p(x,t)=f(xct) or
p(x,t)=g(x+ct). Its derivatives don't satisfy the wave equation.

p(x,t)= 1.0 is a little bit tricky because its derivatives do satisfy
the wave equation, but it can't obviously be rewritten in the forms
p(x,t)=f(xct) or
p(x,t)=g(x+ct). However, since we can rewrite it as
p(x,t)= 1. + 0*(xct), it does represent a wave.
VICTOR W SPARROW
Tue Feb 25 21:24:33 EST 1997