Students investigate and interpret visual representations of sound.
Parts of a wave
* If you are doing this with middle school students, you may need more time.
Students will be able to…
- determine the frequency, period, and wavelength of a sound wave.
Materials in the Kit
Straw Instruments or Tuning Forks
not in the Kit
Computers w/Google Chrome
* You only need an external microphone if the computer does NOT have one built in.
Gather all the materials and hook up external microphones if you need them. You’ll also want to make sure the website has permission to access the microphone.
Introduce the Activity
Tell you students that they will be analyzing different sounds, included their own voices.
Doing the Activity
- Demonstrate how to use the virtual oscilloscope: https://academo.org/demos/virtual-oscilloscope/
- Say the sound “oooo” into the microphone.
- Click the “freeze live input” box
- Print the page.
- Pass out the lab worksheet. Students will work in groups of 3 or 4.
Key Lesson Terminology
- Frequency – Wiggles per second (moves back and forth)
- Amplitude – For transverse waves, it is the maximum height of the wave. Larger amplitudes create louder sounds.
- Period – The time it takes for one wave to go by.
- Wavelength – The distance between two successive, identical parts of the wave. Ex. Crest to crest, or trough to trough.
Have students compare different vowels or consonant sounds.