The output from a signal generator is connected to an oscilloscope - Scottish Highers Physics - Question 21 - 2019
Question 21
The output from a signal generator is connected to an oscilloscope. The trace observed on the oscilloscope screen is shown in the diagram.
The frequency of the sign... show full transcript
Worked Solution & Example Answer:The output from a signal generator is connected to an oscilloscope - Scottish Highers Physics - Question 21 - 2019
Step 1
The frequency of the signal from the signal generator is now doubled.
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Answer
When the frequency of the signal is doubled, the period of the waveform decreases. The new frequency results in a shorter time for each cycle of the waveform.
Step 2
The amplitude of the signal is unchanged.
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Answer
Since the amplitude remains constant, the height of the waveform observed on the oscilloscope will not change.
Step 3
The timebase setting on the oscilloscope is changed from 1 ms/division to 0.5 ms/division.
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Answer
This change in timebase means that the same signal will occupy more divisions on the oscilloscope screen. As a result, the signal will appear more compressed horizontally.
Step 4
Which of the following diagrams shows the trace that is now observed on the oscilloscope screen?
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Answer
Considering the effects above, the trace observed will have doubled frequency and the same amplitude. Therefore, the correct diagram that represents this will be option B.
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