- Now that we have studied a way to measure sound, are there any other factors involved in sound?
- What is a speaker, that is, a stereo speaker that produces sound?
- What does the word ‘stereo’ mean?
- Think about a stereo speaker or your ‘earbuds’ for your phone or mp3 player. How does it produce sound?
- Some PA speakers are a collection of large speakers and small speakers. Why do they have different sizes?
- What is frequency?
- Can a high frequency sound and low frequency sound produce the same decibel level?
HS-PS4-1. Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media.
HS-PS4-5. Communicate technical information about how some technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy.*
- Ask the students about the sounds all around us.
- Have examples of stereo speakers, headphones, amplifiers, or point out any public address speakers in your classroom.
- Ask the students if they know how the speakers produce sound.
- Some people have ‘high’ voices some have ‘low’ voices. Ask the students if they know why.
- Introduce the sound measurement device of your choice and how it is used.
Students may have not given sound measurement much thought. Sound measurement in decibels is taken over time so when students read a decibel meter and see Peak giving a higher number than Max emphasize the difference being the Peak is the loudest instantaneous sound whereas Max is the loudest sound over a period of time.