Name: ___________________________ Date:_____________ Class:________
Student Worksheet for Frequency and Wavelength
Directions: Read through the activity, and then using the scientific method, complete the following activity.
- Label the transverse wave using defined words.
- Problem to be solved:
- Hypothesis- predict an answer to your problem, and back up your prediction.
- Lay your spring on the floor or some other large flat area.
- Have a group member hold one end of the spring while another group member holds the other end.
- Group members holding the ends should remain this distance for all the trials.
- One member is to hold their end of the spring tight and not move their hand.
- Trial one: The other group member is to move their end sharply side to side once to create a single wave that travels down the spring.
*Sound waves travel through the air very much as the spring wave travels down the spring, but sound waves travel faster - about 1/3 Km/sec.
- Trial two: Now create a single wave that begins at one end and ends at the other using the spring. Continue to move your hand side-to-side so another team member can mark where the crests of the wave are and mark with clay on the floor. Refer to the defined term, wavelength, to correctly create a complete wave.
- Label the single wave sketched below.
- Using a meter stick, measure the wavelength and record length on
sketched wave in box.
- Trial three: Groups should have a group member time 10 seconds on a stopwatch while the group member that is making the wave count the number of single waves, (the number of side-to-side hand movements), they make in the 10 seconds. A group member should mark the distance of one complete wavelength using the clay to mark two crest or two troughs.Using Record findings in #8.
- How many times did your hand move side-to-side in 10 seconds?
(a)._______ hand movements in (b.)10 seconds.
*The number of vibrations (side to side movements) per second is called the “frequency” of the wave. To find the Unit of frequency use “cycles/sec”, (cycles are the number of hand vibrations (hand movements) in (b.)__ seconds divide by the number of seconds).
Unit of frequency is also called hertz (Hz)
a._______ hand movements in 10 seconds
b._______ number of seconds
a/b = Frequency = ________Hz
Wavelength = _______cm **
***Students should be creating a single wave crest-to-crest or trough-to-
trough for 10 seconds. For wavelength use the meter stick.
- Trial four: Now create two full wavelengths and sketch in
- Trial five: Now count how many times your hand goes up
and down in ten seconds while keeping two full wave
lengths on the spring. Have a group member mark the
length of one wave and measure with a meter stick.
Frequency = ________Hz
Wavelength = _______cm
- Trial six: Now create three full wavelengths on the spring.
Sketch in the box.
- Trial seven: While keeping three full wavelengths moving on
seconds. Another group member mark the length on one
wave, measure and record.
Frequency = ________Hz
Wavelength = _______m
- Answer these questions:
- What are the controls in the trials?
- What was the independent variable?
- What was the dependent variable?
- Conclusion and Communication:
The group is to discuss “Is there a relationship between a wave’s
frequency and its wavelength?”
Using data they have gathered explain your answer and back it up
with the data. Also address your hypothesis. Record your
conclusion in a short essay on the back of this worksheet.