PHYS133 Lab 7

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Properties of Waves NATALIE AHREND 5850881 PHYS133 C001 LAB 7 PRE-LAB QUESTIONS 1. If a wave traveling through air decreases its wavelength by half, what happens to the wave speed and frequency? The wave speed will remain the same because the medium has not changed. The wave frequency will double because frequency is inversely proportional to wavelength. 2. A transverse wave is traveling down a rope with mass, m = 10 kg, and length, L = 50 m. If the rope is under a tension force of 2000 N, what is the wave speed of the transverse wave? 10/50= .2 2000N/.2= 100 m/s 3. If a slinky has a mass of 0.5 kg and 100 loops, what is the mass density (m/L) of a slinky that is stretched 5 meters but only 80 loops are stretched? 5 x 100/80= 6.25 .5/6.25= .08 kg/m 4. Give one example of where you have experienced the Doppler effect and explain how it represented this scientific principle. I have experienced the Doppler effect while driving and the car behind me is honking their horn. The honking is loud at first when I was close and the sound fades as I drive away. When I was closer to the car, the soundwaves were condensed and as I drove away, the soundwaves became more spread out. ©eScience Labs, 2018
Properties of Waves ©eScience Labs, 2018
Properties of Waves EXPERIMENT 1: WAVES Data Sheet Table 1: Slinky® Measurements Slinky Mass (kg) Number of Loops Mass/Loop (kg/loop) Length (m)  .23  44  5.23x10^-3  2 Table 2: Wave Time Measurements for Relaxed Slinky® Trial Time (s) Tension Force (N) 1   1.06  .5 2  1.11   3  1.10   4  1.26   Table 3: Wave Time Measurements for Increases Tension Slinky® Trial Time (s) Tension Force (N)  1 .66  1.0  2 .83    3 .77    4 .72    5 .73   ©eScience Labs, 2018
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Properties of Waves Table 4: Slinky® Measurements Trial Velocity from Stopwatch (m/s) Velocity from Tension and Mass density (m/s) Percent Difference (%)  1 4.79  2.09 56.4  2 2.69 2.95 8.81 Post-Lab Questions 1. Did the waves seem to go any faster or slower when you tested a variety of amplitudes and frequency? Explain. The frequency did not affect the wave speed. 2. What did you notice about the speed of the longitudinal waves compared to the transverse waves? Why do you think this is? The longitudinal waves were faster than the transverse waves because they move parallel to the ground while the transverse waves move perpendicular to the ground. 3. Use data from Table 1 and Table 2 to calculate the average time it took for the wave to travel down and back. Use this time to calculate the average speed for the traveling wave on the Slinky® for both situations. Fill in Table 4 with your answers. ©eScience Labs, 2018
Properties of Waves 4. Calculate the wave speed using the formula for transverse waves. Fill in Table 4 with your answers. .2/.417= 4.79 m/s 5. Calculate a percent difference between your velocities and record them in Table 4. .5x2/ .23= 2.09 m/s 6. Identify two sources of error. Which method for measuring velocity do you think is more accurate? Which method do you think is more precise? Two sources of error could be timing of wave and distance. ©eScience Labs, 2018

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