Two-source interference pattern with sources oscillating in phase Looking ahead, st in addition to ing waves in pipes
Itier, Emmanuel, Film and Interviews Editor has reference to this Academic Journal, PHwiki organized this Journal Two-source interference pattern with sources oscillating in phase Looking ahead, st in addition to ing waves in pipes On Wednesday in addition to Thursday youll be doing assignments involving st in addition to ing waves in pipes. For those assignments, the data is provided. However, youll do a third assignment as long as next Tuesdays WebEx as long as which you collect your own data. (This 3rd assignment isnt posted yet.) Youll practice collecting sound data next. Recall L145 where you used Logger Pro in addition to a motion detector to record position as a function of time as long as a vertically-oscillating spring. The vertical axis is position, in addition to the horizontal axis is time.
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When using a microphone as a probe in addition to detecting sound waves, LP records Sound Pressure as a function of Time. Try this now Connect the LabQuest Mini to your computer. Connect the microphone to CH1. Open Logger Pro. The microphone should be detected automatically. Go to Experiment, Data Collection. The Duration should be set to 0.03 s in addition to the Sampling Rate to 10000 samples/second. Go to this link: http://onlinetonegenerator.com. Enter 1024 as long as the frequency. Click Play to generate the 1024 Hz tone. Turn up the volume. I know the sound is annoying, but this wont last long. Hold the microphone to your computer speaker. Click the Go button in LP. A wave as long as m should be recorded. Stop the tone. If your graph didnt autoscale vertically, click the A icon at the top. Next youll measure the frequency of the sound in two ways.
Method 1: Do a curve fit to the function: Pres = Asin(Bt + C) + D. Which coefficient can be used to determine the frequency Determining the frequency Method 2 Read the times of two widely-separated peaks. Find the difference of the times. Divide by the number of cycles. This gives the period. Invert to get the frequency. In Method 2, when you place the cursor at a peak in LP, you can read the coordinates in the lower left-h in addition to corner below the origin. The time coordinates show above were read as long as the two peaks furthest apart. The frequency is 1/[(0.009248 s 0.0004454 s)/9] = 1022 Hz
Measuring the fundamental of a toy flute Use the flute that has no holes along the side. Hold the flute near the microphone in addition to blow gently to produce a steady tone. Click Go on LP to record a wave as long as m. Measure the frequency using Method 1. Report your result in a private chat message. Looking ahead, L16 L16, which is due Monday, requires sustained oscillation of a long, helical spring in st in addition to ing wave patterns. Some students find it challenging to produce the st in addition to ing waves. I recommend practicing this well in advance of the due date. You need a clear distance of 5 10 m as long as stretching out the spring. One end of the spring must be fixed in place. This can be done with a sturdy clamp or with a helper who holds the spring. The helper can be another student from this class, but each student must take their turn producing the st in addition to ing waves in addition to must collect their own data. Each student must also carry out the analysis in addition to write the report independently. If you have a helper, cite them as a lab partner. Youll record data in an online as long as m. Theres a preliminary set of measurements that must be done be as long as e you collect the data that youll use as long as the analysis. There as long as e, give yourself plenty of time to a) practice oscillating the spring, b) collect preliminary data, c) collect final data, d) do the LP analysis, e) answer the questions. Cause in addition to effect in using v = fl Consider the equation v = sqrt(FT/m). When we write an equation in this as long as m, the quantity represented by the symbol on the left, v in this case, is typically taken to be a function of the quantities on the right. Thought of another way, the tension in addition to linear density of the string are causes in addition to the speed of the wave is the effect. This convention does not apply to v = fl. Frequency in addition to wavelength are not causes of wave speed. The fact that textbooks typically write v = fl leads many students to incorrectly conclude that wave speed depends on frequency in addition to wavelength. In order to be consistent with the convention that the dependent variable is on the left of the equal sign, we should write: = v/f or f = v/l. The wave speed typically serves as a constant of proportionality. It depends on the properties of the medium, which do not change significantly in many situations.
Drawing of st in addition to ing wave patterns When you draw a st in addition to ing wave pattern, do the following: Draw 2 curves, one as long as each extreme of the motion. Draw the equilibrium position. This will make it clear where the nodes in addition to antinodes are. equilibrium line While were on the subject what systems that youre aware of have antinodes at one or both ends of the st in addition to ing wave
Download link as long as the clip http://courses.ncssm.edu/apbres/clips/spring-hs.mov V20. St in addition to ing Waves on a String Prelab questions: Describe a method to accurately determine the linear density of the string. The most direct method is to use a mass balance to measure the mass in addition to then divide by the length of the string. To improve accuracy, the longest length available (within reason) should be used. How can you calculate the tension in the string What assumption(s) is(are) involved If there is no friction of the string with the pulley, then the tension is equal to the hanging weight. Multiply the mass of the hanging weight by 9.8 m/s2. Given the weight hanging from the string in addition to the linear density, how can you calculate the wave speed in the string Use v = (FT/0.5). V20, cont. Draw the st in addition to ing wave pattern of the fundamental. If the length of the string is L, what is the wavelength of the fundamental l1 = What frequency do we need to set as long as the oscillator to generate the fundamental (in terms of v in addition to L) f1 = equil line
V20, cont. What if we wanted to generate the 2nd harmonic What frequency would be needed f2 = Will this change in the frequency change the wave speed Explain. How could we change the wave speed to make it, say, 25% greater than its present value V20, cont. If we changed the wave speed, how would the wavelength have to change to produce 2 antinodes For the greater wave speed, how would the frequency have to change to produce 2 antinodes. Suppose one did an experiment to measure fn vs. n as long as n = 1 to 4 with the string under constant tension. If one then did a linear fit to a plot of fn vs. n, how would one use the slope of the fit to determine the wave speed answer left as long as L16 analysis V20AL Complete this assignment after todays session is closed. Determine a as long as mula in terms of things measured in the video as long as the unknown amount of mass ma that the instructor added to the string near the end of the video. (This is the mass added to the original mass, m, that was already present.) The symbols that you may have in your final equation are m, f1, f2, f3, in addition to f4 as long as the four measurements of frequency. You will not need all of the symbols. Linear density will not be needed, as it will divide out. After determining the as long as mula, calculate the value of ma.
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