> True, speed of sound also travels slower in mediums but again in a
> vaccum is the fastest that sound will travel. Now frequency is another
> quality which you maybe referring to. Doupler Effect!
>
...
>
> v/r Ken Carrigan
>
===================================================================
OOPS! I think there is a slight oversight here. Sound needs a medium
to propagate through. A vacuum should not propagate sound. This does
bring out an interesting point though. RF will propagate through a
vacuum. Warren