frequency
0
.
18
time
harmonics
1st
2nd
3rd
4th
5th
first
harmonic
click
and
drag
the
line
to
change
the
cavity
length
5
10
15
20
length
-
2
-
1
1
2
amplitude
forward
and
backward
waves
5
10
15
20
length
-
2
-
1
1
2
amplitude
standing
wave
