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Frequency & Amplitude Introductory Presentation. Opening Activity In Clap On, Clap Off, we used the...
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Transcript of Frequency & Amplitude Introductory Presentation. Opening Activity In Clap On, Clap Off, we used the...
Frequency & AmplitudeIntroductory Presentation
Opening Activity
In Clap On, Clap Off, we used the LEGO Sound Sensor to control when our robot moved and stopped.
Opening Activity
Answer the Following:
1. What is sound?
2. How does it travel?
3. How do we measure sound?
Review
Sound Sound is traveling energy which takes the form of regions of compressed air, soil, or whatever it’s traveling through.
Review
We measure sound by some of its properties such as:
• Wavelength• Frequency• Amplitude
Review: Wavelength
WavelengthIf someone were talking to you, Wavelength would be the distance between the regions of compacted air that their voice is creating.
Wavelength Wavelength Wavelength Wavelength
Review: Frequency
FrequencyFrequency is a measure of how many of the compacted regions, or wavelengths, pass a certain point over an interval of time.
Point
Review: Frequency
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.
Low Frequency
High Frequency
1.5 wavelengths
3 wavelengths
Review: Frequency
We perceive frequency as the pitch of a sound. Thus, frequency determines how high or low a specific sound is.
high notes = high frequency
low notes = low frequency
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
Review: Amplitude
AmplitudeAmplitude, 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.
Review: Amplitude
Amplitude
The harder they push they louder the sounds.
The softer they push, the quieter the sound.
Review: GraphingAs a refresher on how to graph results, examine the chart below created with the included data.
Recorded Measurement
Trial 1 20
Trial 2 50
Trial 3 70
Trial 4 30
Data collected from experiment Data within a chart
Reminder
One last thing!Make sure you have speakers connected to
your computer, otherwise your robot won’t have anything to listen for.
Now you have the necessary knowledge to get started in the Frequency & Amplitude Activity.
Good Luck!