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Standing waves are are useful phenomena to investigate waves. When a standing wave forms, it is easy to measure the wavelength because the wave appears motionless. 1. 1. Choose a Cord # and Hanging Weight, click Load and play the video. 2. Use the step buttons or video slide bar to adjust the frame until it clearly shows the harmonics generated by the standing waves. The diagram shows the first harmonic. Direct Measuremen 2015 Peter Bohace 3. Click on the Toolbox icon. Use the vertical metric ruler to measure the amplitude of the wave. Place it at the widest portion of the standing wave. Divide the measured value by two and record this as amplitude in meters. 4. Use the horizontal metric ruler to measure the length of one harmonic. Since 1 wavelength=2 harmonics, multiply the measurement by two. Record this as wavelength in meters. 5. Record the frequency reading from the wave generator. speed or velocity (ms) 6. Calculate for your velocity using the equation: V = f framune (44) wavelength (m)
7. Record your measurements and calculations in Table 1. 8. You can also download and use the attached Excel worksheet posted in Blackboard to verify your calculations. Enter your measurements only in the highlighted sections of the worksheet! 9. Use the same steps for harmonics 2-6
me wrt 3 4 5 2. Table 1. Amplitude, wavelength, frequency and wave velocity at different harmonics. Hint: Use the leftmost unlabeled column for harmonics. Amplitude Wavelength *** Frequency Velocity O m variable m 1/s m/s 0.025 1.0 10.3 0.020 0.99 20.3 0.015 0.70 30.9 0.010 0.50 41.3 0.38 51.6 0.30 61.8 1 2 www www *** ... www 0.005 6 *** 0.003 + Add Another Graph variable Hz 10.3 20.1 21.6 20.7 19.6 18.5 1 variable
3. As the number of harmonics increases, the wavelength decreases. As the wavelength decreases, what happens to the amplitude BIU EECE I noticed that as the wavelength decreases, the amplitude will decrease too. However, the amplitude does not affect waveleng Score: 0/5 4. As the wavelength increases, what happens to the frequency of the wave? BIU EEEE f As a wavelength increases in size, the wave's frequency decreases. Score: 0/5 5. Aside from what you have identified above, did you find any other patterns in the result that you obtained? Briefly disca identified pattern. BIU EEEE □fx
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