Sound Waves (1)_edited (1)

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Dec 6, 2023

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Sound Waves Procedures: Go to https://phet.colorado.edu/en/simulations/sound/ and click on the sim to download. When you click on the download file, it will open the lab simulation. Questions: Listen to a Single Source: 1. Observe the sound waves coming from the speaker. a) What do the dark and light bands represent? (Remember, sound waves are longitudinal waves.) b) Why do the waves get lighter with distance from the speaker? c) How does changing the frequency and amplitude affect the depiction of the sound waves in the sim? d) How do you think changing the frequency and amplitude affect the sound heard by the listener? Measure: 2. Press “start” and move the ruler to the center of the speaker. a) Look at the stopwatch. What do you notice that is strange about it? Why is it programmed this way? b) Describe how you would find the frequency of a wave if the frequency slider did not have a number display. Test your idea with a variety of waves (record them in a data table) and describe how well your procedure gives results that match the frequency display. The waves get lighter with distance from the speaker because as the distance increases the intensity of the wave decreases. By changing the frequency the wavelength changes. When we increase frequency we get more oscillation and the wavelength decreases and when we decrease frequency the oscillation decreases and wave length increases. When changing the amplitude the height of the waves change. By changing the frequency we affect the clarity of the sound wave. By changing the amplitude we affect the loudness of the sound wave. time for 5 meters wavelength To find the frequency of a wave we need to know the time period so we can divide 1 by T to get the frequency. T=(t*wavelength)/5 f=1/T T f f displayed 1m 0.0127s (0.0127*1)/5 393.7 400 1.2m 0.0145s (0.0145*1.2)/5 287.3 300 The dark bands represent compression and the light bands represent expansion.

c) Describe how you would find the period of a wave without using the frequency information. Test your idea with a variety of waves and record your experiment in a data table. Check your method by calculating the period using the frequency (T = 1/f). Show calculations. d) Hit stop and reset, and measure the distance a wave travels in a certain amount of time. Make a data table and do at least 3 trials. Find the speed of sound using v = d/t. e) Use the ruler to measure the wavelength of this sound wave. Check the speed calculated above using v = fλ. Two-Source Interference: 3. Observe the interference pattern made by the sound waves coming from two speakers. a) Sketch the pattern using shades of gray. t(s) wavelenght T f slider f 0.0139s 0.0143s 3.5 0.4 (0.0139*3.5)/5 (0.0143*0.4)/5 102.7 774.1 95 800 Period: T=1/f 1/102.7= 0.0097371 1/774.1=0.00129182 =0.00973 =0.001144 t(s) s(m) v=s/t (m/s) 0.0143s 0.0139s 0.0127 5 5 5 349.6 359.7 393.7 speed of sound: (349.6+359.7+393.7)/3 =367.7 m/s v= 102.7*3.5 v=359.45

b) Describe what is happening with the waves where you see white spots, dark spots, and gray spots. Draw some pictures of waves to help your explanation. They are going through constructive and destructive inferences

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