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Checking a Filter at Two Detector Distances 4 questions
Checking a Filter at Two Detector Distances
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A display tests a lamp and a light filter. The detector can sit 1 m or 2 m from the lamp. Without the filter, the beam spreads over a larger area at the greater distance. The filter is assumed to pass a fixed fraction of the light that would otherwise reach the detector at that distance.
| Detector distance | Reading without filter | Reading with filter |
|---|---|---|
| 1 m | 80 | 40 |
| 2 m | 20 | 10 |
Question 1
Which pair should be compared to calculate filter transmission at 2 m?
- 80 and 40
- 80 and 10
- 20 and 40
- 20 and 10
Question 2
Calculate the fraction passed by the filter at each distance.
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Question 3
A student says the 10 reading at 2 m proves the filter passes less of the light there than at 1 m. Evaluate the claim.
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A third position gives a reading of 18 with the filter. The class has not made an open reading there.
Question 4
Predict the open reading at that position if the filter continues to pass the same fraction. Explain how to check the prediction.
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