Physics lab. These are pretty simple questions but I suck with physics. Please h
ID: 1769792 • Letter: P
Question
Physics lab. These are pretty simple questions but I suck with physics. Please help! To see what the waveform would look like if the two waves combined in air by linear addition, you can use the data table to add the individual waves. In Run 2, click on the Sound Level' column heading to select the entire column and choose Copy from the Edit menu. In Run 1, click on the first data cell in the Add' column and select Paste from the Edit menu. All of the sound level measurements from Run 2 should appear in this Add' column, although it may take up to a minute to appear. To display the added waveforms contained in the 'Sum' column of Run 1, click on the y-axis legend of the lower graph window and check only the 'Sum box for Run 1. You may have to scroll up or down to find the waveform (the appropriate scroll arrow will turn green to let you know). Do the experiment. Hit both tuning forks, holding the microphone in the same position as before. The trace should appear in the upper graph window (you may hide the other two runs if you wish). Try it several times. as the relative loudness of the two forks is hard to equalize. With the simultaneous recording of the two tuning forks displayed in the upper window and the sum of the two individual waveforms in the lower window, print both by choosing Print Screen from the File menu. . 1. How does the waveform compare to your prediction? 2. What is the frequency of the beats? How is this related to the frequencies of the two pure tones? In the beat waveform, what is the frequency of the wave pattern within a beat? How is this related to the frequencies of the two pure tones? 3. 4. With the exception of people with perfect pitch, musicians typically must compare with some known frequency (generated perhaps by a tuning fork) to tune their instruments. Explain why beat frequencies are useful in tuning?Explanation / Answer
1) The waveform of the beats will be a typical waxing-waning waveform. With a peak(maxima) and a trough(minima) within a single cycle. Then the waveform will damp down but continue with the same pattern later.
2) If the frequency of one of the tuning fork is f and the other one has f +n, the frequency of the beats is f=n - f = n beats per second
3) The beat waveform as described in the first answer is the combined waveform of the waveforms produced by the two tuning forks
4) To tune an instrument to say 256 Hz, a tuning fork of 255 Hz is bough close to that instrument. When the tuning of the instrument is quite near to that of the tuning only with a difference of 1-2 Hz and both are struck together, beats are produced. This is an indication that the tuning is almost right and only a miniscule more is needed.