Wave interference EXPERIMENTS
::
E-401
Procedure Mark the mid-point between the two dippers “X” and
The mirror and screen are not used. Watch the wave pat-
mark the directions where you observe constructive as
tern projected directly on the table top. Place a large
well as destructive interference (use for different colors).
sheet of paper to be able to mark important features of
The direction perpendicular to the line through the dip-
the patterns with a pencil.
pers should follow the points with constructive interfe-
The projected image is scaled by a constant factor com-
rence in 0
th
order (m = 0).
pared to the physical waves on the water surface. This
Repeat this with different frequencies. Use a fresh sheet
does not interfere with the validity of any of the formulae
of paper for every experiment to avoid confusion.
above, as long as we perform all measurements the
Fill out a table as the one below for each frequency. The
same place. You will only work with the projected image
angle θm from the 0
th
order line to the m
th
order is measu-
in this experiment.
red on the paper by extending the lines all the way to the
Mount the wave generator with two dippers. Mark the
“X”.
position of their shadows on the paper.
Compare the two bottom lines in the tables.
Measure the distance d between them (remember: on
the projected image).
Adjust frequency and amplitude until you see a clear
interference pattern like that in figure 2.
Required Equipment
2210.60 Ripple Tank 1,00 Pcs
Experiment 1
λ
m 1-12-2. .
θm
m ·λ /d
sin (θm)
Experiment 2
λ
m 1-12-2. .
θm
m ·λ /d
sin (θm)
®
Science Equipment for Education Physics
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