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Calibrating Two Colors in a Model Light Meter 4 questions
Calibrating Two Colors in a Model Light Meter
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A class compares two colors in a model light meter. A reading of power describes how much light energy arrives per second. The meter’s signal depends on the color. In the supplied range, doubling power doubles the signal for that color.
| Single-color standard | Known power (mW) | Meter signal (units) |
|---|---|---|
| Blue | 1.0 | 8 |
| Red | 1.0 | 4 |
Question 1
What does the standard test show?
- The meter gives the same signal for equal powers of blue and red.
- The meter gives a larger blue signal even when the powers match.
- The red standard supplies twice the power of the blue standard.
- The meter responds only to blue.
The class tests a beam containing both colors. A filter that lets only blue pass gives 8 units. A filter that lets only red pass also gives 8 units. In the model each filter passes all of its selected color.
Question 2
Use the standards to estimate the power of each color in the mixed beam.
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Question 3
Explain why the two equal filtered signals do not show that the colors deliver equal power.
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Question 4
Describe a check using a single-color standard to find out whether the red filter passes some blue light.
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