pvc frame, speaker, horn, function generator
Description:
An
illustraion
of
constructive
and
destructive
interference.
The
path
length
of
the
lower
half
is
fixed,
whereas
the
path
length
of
the
upper
half
is
variable.
Select
a
frequency
with
the
generator
and
slowly
raise
the
upper
part
of
the
frame.
Zones
of
constuctive
and
destructive
interference
are
easily
heard.
PIRA 3B55.45