act14ans - Do NOT write on these sheets or take them with...

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Do NOT write on these sheets or take them with you! The next class needs them too! PHYS-1200 PHYSICS II SPRING 2006 Class 14 Activity: Sound Waves and Electromagnetic Waves Sound Waves Equipment: Laptop running "function generator" from Physics II website. Microphone box LabPro interface Procedure: -- Go to the Physics II website under "activities" and save the file "function generator" to your desktop. -- Open the function generator and type in 500 Hz next to the frequency bar. -- Raise the left speaker amplitude to a value that allows you to hear the signal easily. You probably want your laptop volume control on a middle setting. -- Start off with a sine wave and vary the frequency using the slider bar to hear how the pitch rises and falls with frequency. -- Try the square wave and triangle wave to see how they sound. Notice how the sine wave sounds "smoother". -- Set the function generator back to 500 Hz for the experiment. If you have LoggerPro 3.2 you will need the file Mic3.xmbl. You can download the file from the course web page under “Class Activities”. Be sure to use Internet Explorer not Netscape to open this LoggerPro file. Save the file on your computer, then double-click on it to start LoggerPro with the appropriate settings. If you have LoggerPro 2.2, download Mic2.mbl. 1. Be sure that the graph axes are labeled “Microphone Voltage” and “Time”. If they are labeled simply “Voltage” and “Time”, you have not opened the correct file and should re- read the comments above. Place the microphone up against (touching) the left speaker on
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act14ans - Do NOT write on these sheets or take them with...

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