Access: Go to http://phet.colorado.edu., click on ‘Sound Waves’ simulation. 1) In the Sound Waves simulation, go to the ‘Listen to a Single Source’ tab. a. Explain what happens when you move the man back and forth. b. Increase and decrease the frequency and record what happens to the waves and the sound. Record your results. c. Increase and decrease the amplitude and record what happens to the waves and the sound. Record your results. d. What can you conclude about amplitude and frequency of sound waves? 2) Now go to the ‘Measure’ tab. a. Measure how long it takes the sound waves to reach 5 meters and calculate the speed of sound in m/s. b. Increase or decrease the frequency and amplitude of the waves and see if they make a difference in the speed of the waves. Record your results. 3) Go to ‘Two Source Interference tab. a. What happens to the sound when there are two sources? b. What happens when you adjust the frequency and amplitude of the two sources? 4) Go to ‘Interference by Reflection’ tab. a. Change the wall’s angle and record your observations. b. Change the wall’s position and record your observations. 5) Go to ‘Listen with Varying Air Pressure’ tab. a. What can you hear when the pressure is at 1 atm? b. Now remove the air from the box and record what happens. c. What can you conclude about sound in a vacuum? Why do you think this happens?
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