1. Frequency & Amplitude

2. Opening Activity
In Clap On, Clap Off, we used the LEGO Sound Sensor to control when our robot moved and stopped.

3. Opening Activity 1. What is sound? 2. How does it travel?
Answer the Following:
1. What is sound?
2. How does it travel?
3. How do we measure sound?

4. Review
Sound
Sound is traveling energy which takes the form of regions of compressed air, soil, or whatever it’s traveling through.

5. Review We measure sound by some of its properties such as: Wavelength
Frequency
Amplitude

6. Review: Wavelength Wavelength
If someone were talking to you, Wavelength would be the distance between the regions of compacted air that their voice is creating.
Wavelength

7. Review: Frequency Frequency Point
Frequency is a measure of how many of the compacted regions, or wavelengths, pass a certain point over an interval of time.
Point

8. Review: Frequency Frequency
Low Frequency
1.5 wavelengths
Frequency
The more wavelengths that pass in a set amount of time, the higher the frequency. The fewer wavelengths that pass in a set amount of time, the lower the frequency.
3 wavelengths
High Frequency

9. Review: Frequency
We perceive frequency as the pitch of a sound. Thus, frequency determines how high or low a specific sound is.
low notes = low frequency
high notes = high frequency

10. Review: Frequency
So would a soprano sing high frequency notes or low frequency notes?
If you listened to a bass player would you be hearing high frequency sounds or low frequency sounds?
High frequency sounds
Low frequency sounds

11. Review: Amplitude Amplitude
Amplitude, commonly referred to as volume, is a measure of how hard the compacted regions of energy are pushing into what’s in front of them.

12. Review: Amplitude Amplitude
The harder they push they louder the sounds.
The softer they push, the quieter the sound.

13. Review: Graphing
As a refresher on how to graph results, examine the chart below created with the included data.
Data collected from experiment
Data within a chart
Recorded Measurement
Trial 1 20
Trial 2 50
Trial 3 70
Trial 4 30

14. Reminder
One last thing! Make sure you have speakers/headphones connected to your computer, otherwise your robot won’t have anything to listen for. Be respectful of the people around you when listening to the sounds.