**Wave
in a Ripple Tank
** Measure f, λ,
and v of water waves

Obj:

**Methods**

**I. Wavelength**

1. Produce traveling
waves approximately 2 cm apart by adjusting the motor speed of
the ripple tank.

2. Using a
stroboscope, "hold" the wave pattern still, then have
your partner mark *your* data sheet 3 or 4 λ apart.
Wavelengths are measured from "bright to bright"
areas.

Record
the: # waves:_____, total
distance: __________cm;
1 λ = _______cm

3.
Produce standing waves using the long block as described.
What evidence indicates they are standing waves?

**II.
Frequency**

1. Hold the wave
pattern stationary with the stroboscope.

2. Record the time
for 10 rotations.
________s (Use a countdown method.)

Count
the number of slots on the strobe _______ x number of rotations =
total number of waves _______

Frequency
= number of waves / total time

**Analysis**

1. Calculate the
period and wave speed in **Method II. **

2. What do the
"bright" and "dark" lines represent in the
standing waves of **Method I:Question 3**?

3. Determine the
magnification ratio of the image wave / real wave using a washer,
then determine the actual λ in the ripple tank from **Method
I. ** *How
does this affect your calculations for f, T, and v?*

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