# Activity 2

 Activity Title:  Understanding Sound Measurement Unit Title:  Feel The Noise Estimated Duration:  2 Days Setting:  Classroom Materials: Worksheets, graphing calculators (optional), sound meter or sound meter app, app such as Dog Whistle (free), Tone Generator app (free), or a method of generating sound of a given frequency.  Worksheet: Measuring  Decibels Teacher Advance Preparation: The teacher should familiarize themselves with the concepts of sound and the measurement of sound in watts/ square meter converted to the decibel scale.   Author:  David Macmorine Date:  July 2014
##### Activity Objectives

The students will be to identify the nature of sound measurement

Here is an example of a decibel meter.  Peak is the highest sound monitored regardless of length of time. Max highest decibel reading over a given time period (depending on the specific meter).  Average is the average over the time period the decibel meter has been monitoring sound.

##### Guiding Questions
1. Now that we have studied a way to measure sound, are there any other factors involved in sound?
2. What is a speaker, that is, a stereo speaker that produces sound?
3. What does the word ‘stereo’ mean?
4. Think about a stereo speaker or your ‘earbuds’ for your phone or mp3 player.  How does it produce sound?
5. Some PA speakers are a collection of large speakers and small speakers.  Why do they have different sizes?
6. What is frequency?
7. 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.*