Doppler Effect simulator lab

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Trine University *

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164

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Physics

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Oct 30, 2023

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Doppler Effect Lab Name: __________________ In this activity you will be examining how the wave pattern changes as the object creating the waves changes its speed. Procedure: Go to the following website. https://www.thephysicsaviary.com/Physics/Programs/Labs/DopplerLab/index.html Part 1: Subsonic Speeds 1. In this part of the lab you will be looking at the wave patterns around objects that are traveling slower than the waves travel. 2. Begin with the frequency set on 1.0, the wave speed set on 100 and the object speed set on 0.. 3. Start the program and allow your object to make a few waves. Pause the program and measure the wavelength of the waves both in front and in bock of the plane. Use these wavelengths and speeds to calculate the frequency. 4. Record your information in the data table. 5. Continue this procedure until you have filled in the table. You may choose whatever speed of the plane you want. 6. Finally, set your object speed back to 70 m/s. Allow the plane to travel about 70% of the way across the screen and then pause your simulation. Carefully, sketch the plan and its wave pattern below: Drawing: Subsonic speed Data Table (part 1) Speed of plane (m/s) Wavelength in front of plane (m) Frequency in front of plane (Hz) Wavelength behind plane (m) Frequency behind plane (Hz) 0 10 100 Questions: Part 1:
What happens to the frequency in front of the plane as you increase the speed of the plane? What happens to the wavelength in front of the as you increase the speed of the plane? What happens to the frequency in the back of the plane as you increase the speed of the plane? What happens to the wavelength in back of the plane as you increase the speed of the plane? Part 2: Sonic speed 1. In this part of the lab you will be looking at the wave patterns around objects that are traveling at the same speed that the waves travel. 2. Begin with the frequency se ton 1.0, the wave speed set on 100 and the object speed set on 100. 3. Start the plane moving across the screen and notice the pattern in front of the plane. Pause your simulation when the plane has progress about 75% on the way across the screen. Draw this pattern below and calculate the wavelength and frequency in front and behind the plane. Include these numbers in your drawing. Drawing: Sonic Questions: Part 2 Compare the wavelength in front and behind the plane when it is traveling the speed of the wave. Compare the frequency of the wave behind and in front of the plane when it is traveling the speed of the wave.
Part 3: Supersonic speeds: 1. In this part of the lab you will be looking at the wqave patterns around objects that are traveling at speeds greater than the waves travel. 2. Begin with the frequency set on 4.0, the wave speed set on 50 and the object speed set on 50. 3. Start the plane moving across the screen and notice the pattern in front of the plane. You don’t need to write anything down at this point but keep a mental note of what the pattern looks like. 4. Increase the speed of the plane to 60 m/s and allow it to move about 75% of the way across the screen. Pause the simulation and make a sketch of the plane. Drawing: Supersonic speeds: 5. Increase the speed by 10 m/s at a time and observe the pattern formed by the wave. You do not need to record anything just observe. 6. When you hit 100 m/s, stop the plane at 75% and draw another sketch. Drawing Supersonic speeds at 2x the speed of sound. Questions: part 3 Describe the changes that happen to the cone of waves behind the plane as the plane’s speed increases.
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