Physics > Lab Experiment > PHYSICS 2020R50 Physics 2020 Course Chapter 23 Lab Activity final (Repaired): Course Chapter Twenty  (All)

PHYSICS 2020R50 Physics 2020 Course Chapter 23 Lab Activity final (Repaired): Course Chapter Twenty Three (23) Lab Activity

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Course Chapter Twenty Three (23) Lab Activity Name: ___________________________________________________________________ DETAILED INSTRUCTIONS FOR LAB ACTIVITY COMPLETION: This is your lab acti... vity for the course chapter twenty-three (23). Therefore, the first step is to visit the following webpage: http://phet.colorado.edu/simulations/sims.php?sim=Wave_Interference The purpose of this webpage is to provide you with the simulation to complete this lab activity. This lab activity has two (2) sections. The purpose of each of these two (2) sections is to provide you with an opportunity to learn the principles of physics and apply them to solve relevant problems. Upon completion of these two (2) sections, you will be better prepared to tackle future physics problems and the examinations in this course (the midterm examination and the final examination). Section 1 requires you to produce a lab report and the section 2 requires you to answer questions. The second step is to scroll down to each of the two (2) sections and follow the instructions given in each section. Once you have completed each of the sections, move onto the third step. The third step is to ensure that you have completed all the relevant questions and sections for this lab activity, and then submit your work to the dropbox within the course. OBJECTIVES: Objectives At the end of this lab activity, the student should be able to  Discuss different waves. At the end of this lab activity, the student should be able to  Solve problems involving amplitude and frequency and refraction. At the end of this lab activity, the student should be able to  Devise experiments and write satisfactory laboratory reports SECTION ONE (1) – INSTRUCTIONS FOR COMPLETING SECTION ONE (1): 1. Click on “Run Now” within the simulation. The link to the simulation was provided in the “DETAILED DIRECTIONS FOR LAB ACTIVITY COMPLETION.” 2. Run the simulation. 3. Use the simulation to develop the laboratory report. 4. Ensure that you have completed the lab report, and then move to “Section Two (2).” DIRECTIONS TO DEVELOP LAB REPORT: 1. For this section, you must write a laboratory report of an experiment to describe a relationship between wave length and frequency. Use the simulation to conduct your experiment and gather data for this section. Under the heading, “Supporting Activities,” some possible activities are given (These activities are to give you an understanding of the experiments you can use for your lab report). 2. Follow the general outline of a lab report as provided in the link below: http://www.utm.edu/staff/cerkal/report.html 3. Remember to show your calculations where necessary. These laboratory reports will prepare you to do well in the future lab activities and in the project. Supporting Activities (Provided only to support the development of your lab report – Do not submit the activities given here with the lab report. In this section one (1), you only have to produce the lab report covering all the headings of a lab report with data and calculations): Introduction: When waves momentarily overlap, they temporarily add their amplitudes without affecting the original waves. This interference can be seen when two wave sources are used and their overlaps viewed. You will view this phenomenon in parts I and II of this lab. When a wave strikes a barrier, some of the energy will bend around the barrier and spread out. This is known as diffraction. In part three of the lab, you will view the results of splitting a single wave source with a narrow slit, and then observe as the new waves created at the slit interfere. The interference pattern that results is symmetrical. The bands of constructive interference are referred to as maxima (single=maximum). Important Formulas: Please note that many texts use n to represent the nth maximum from the central maximum. The College Board has chosen to use m, I suspect so as not to be confused with index of refraction. Procedure: PheT Simulations  Play With Sims  Sound and Waves  Wave Interference Part I: Water Waves Analogy take some time to familiarize yourself with the simulation’s controls • Observe the water waves created in the faucet analogy. The darker areas are areas of higher amplitude. • Adjust frequency and amplitude and observe the characteristics of the waves. • Comment on the waves as amplitude is changed: • Comment on the waves as frequency is changed: • Now add a second drip to the simulation. Observe the interference of the two water waves. • Comment on the interference of the two waves: Part II: Light Wave Interference Please note the waves take some time to settle out and show good graphs-be patient • Change the simulation to show extremely-slowed light emission from the single-light source. • Observe the wavelength of red light and then move the wavelength slider to cyan or blue light. • Comment on the actual wavelength of blue light versus red light. o • Add the screen to show how the light would look if viewed on a screen • Add a second light source and view the interfering waves and the pattern they create on the screen. • Showing the Intensity Graph quantifies the energy that is incident upon the screen. What effect does amplitude have on the maxima separation in the interference pattern? What effect does source spacing have on the maxima separation in the interference pattern? What effect does wavelength have on the maxima separation in the interference pattern? Part III: Light Wave Diffraction • Reset the light waves simulation and show the screen and graph. • Add a 2-slit barrier to the simulation and allow the graphs to be formed. • Observe the interference pattern created when the characteristics of the simulation are adjusted. • You may have to adjust amplitude when other elements of the simulation are changed to observe the graph. What effect does a larger amplitude have on the maxima separation in the interference pattern? What effect does a shorter wavelength have on the maxima separation in the interference pattern? What effect does a larger barrier-to-screen distance have on the maxima separation in the interference pattern? What effect does a smaller slit width have on the maxima separation in the interference pattern? What effect does a smaller slit separation have on the maxima separation in the interference pattern? Conclusion Questions and Calculations: You may check your approximate answers in the simulation 1. Why would a helicopter passing over or near a TV antenna cause a garbled or unusable TV signal? 2. The simulation uses monochromatic light. If white light was used instead, what would be seen on the screen? _________________________________________________________________________ 3. As wavelength of the incident light increases (bluered) the maxima separation increases / decreases. 4. Two thin slits with separation of .0250mm are placed over monochromatic orange laser light at 610.nm. What is the small angle measurement from the central maximum (zero degrees, inline with the source) to the first maximum? 5. A beam of green light is split by thin double slit with separation of 0.0500mm and incident upon a screen some distance away. The angles of the first and second maximums are .584o and 1.17o respectively. What is the wavelength of the green light? 6. A single, monochromatic indigo light source is shined through an etched, flat prism with a slit separation of .0250mm. The resulting interference pattern is viewed on a screen 1.25m away. The third maximum is found to be 6.6cm from the central maximum. What is the wavelength of the indigo light? 7. Where are the first and second maxima? and 8. When the two additive colors blue (475 nm) and green (510 nm) are incident in equal magnitudes upon a white screen, the subtractive color cyan results. Consider two beams, one blue and one green. The blue beam is shined through a double-slit diffraction grating with slit distance of 0.0400 mm and then displays an interference pattern on a screen 1.00m away. If the green beam is then shined from the same position as the blue beam, what size diffraction grating would be required for the green beam so only a cyan interference pattern would be seen on the screen? * You only need to submit a comprehensive lab report for the section one (1). The questions given under the supporting activities are not necessary to be submitted with the lab report. If you have any questions regarding the answers to the above questions, you may contact the professor. Once you have completed each of the prior directions for Section One (1), save your work and move onto Section Two (2) SECTION TWO (2): INSTRUCTIONS FOR COMPLETING SECTION TWO (2): 1. Answer the following questions: 1. A jellyfish is floating in a water-filled aquarium 1.46 m behind a flat pane of glass 3.90 cm thick and having an index of refraction of 1.5. (The index of refraction of water is 1.33.) (a) Where is the image of the jellyfish located? (Find the location of the final image, taking the inside and outside surfaces of the pane of glass as two refracting surfaces. Use a negative number to indicate the image is in the tank. Measure the distance from the air-glass interface. Enter your answer to three decimal places.) (b) Repeat the problem when the glass is so thin that its thickness can be neglected. (Use a negative number to indicate the image is in the tank. Enter your answer to three decimal places.) Submit Section One (1) and Section Two (2) to the relevant dropbox within the course. [Show More]

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