# Act16 - Do NOT write on these sheets or take them with you The next class needs them too PHYS-1200 PHYSICS II Class 16 Activity Beats and the

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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 2005 Class 16 Activity: Beats and the Doppler Effect Beats In this part of the activity you will study the phenomenon of beats using an Excel spreadsheet. The spreadsheet is already programmed to plot the sum of two sinusoidal waves of different frequencies. You will be able to change the frequencies and amplitudes of each of the waves, and observe the results. A picture of the spreadsheet is provided below. The frequencies of the two signals are entered in cells B4 and B5, and the amplitudes in cells B7 and B8. everything else is calculated and graphed automatically. A link to the spreadsheet is provided at the Physics II website, under “Class activities”. The graph of x 1 + x 2 as a function of time clearly shows the variation of amplitude known as beats. Open the program and follow the instructions below. 1. With f 1 = 400 Hz and f 2 = 430 Hz, and both A 1 and A 2 equal to one, measure the length of time that one beat lasts; in other words, the period of one beat ( T beat ). Then take the reciprocal of the period (1/ T beat ) to find the beat frequency. Record the results on your paper in the form shown below. T

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## This note was uploaded on 09/17/2008 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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Act16 - Do NOT write on these sheets or take them with you The next class needs them too PHYS-1200 PHYSICS II Class 16 Activity Beats and the

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