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# Physics II Lab w answers_Part_10 - the trace changes as the...

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31 the trace changes as the position of the microphone is varied along the bench. Measure the period of signal by reading the number of horizontal divisions separating the minima of the signal on the CRO screen. From the chosen scale for the time base determine the time interval between successive minima of the trace and hence calculate the frequency of the signal and compare with the frequency generated by the audio generator. Next place the microphone close to the wall and move it away from the wall. Note down the positions of the nodes, i.e. where the amplitude of signal on the CRT screen becomes minimum. Note down the positions of at least five successive nodes. Repeat this measurement for three different frequencies. PART A Set the Trigger source for the oscilloscope to external Trigger. Connect the output of the speaker to the X input of the scope. Observe the Lissajous pattern produced on the screen. Move the microphone along the bench and observe different Lissajous patterns. Sketch the observed patterns for

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