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Checking Colored Glass Under Two Lamps 4 questions
Checking Colored Glass Under Two Lamps
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A glass workshop sorts two panels using a lamp and a light meter. The meter reads how much light passes through a panel. In the classroom model, reflection and scattering are negligible, so light that does not pass through is absorbed. The class uses narrow bands of red light and blue light.
| Panel | Red light transmitted (%) | Blue light transmitted (%) |
|---|---|---|
| M | 80 | 20 |
| N | 80 | 65 |
Question 1
Calculate the percentage of the blue light that panel M absorbs in this model. Show your setup.
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Question 2
Which lamp by itself can distinguish M from N using the light meter?
- The red lamp only
- The blue lamp only
- Either lamp by itself
- Neither lamp
On a second test a technician gets different meter readings with the two lamps, even with the panel removed. The meter reports the amount of light that reaches it.
Question 3
Explain how the technician can use the readings with the panel removed to compare transmission percentages fairly.
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Question 4
A student claims that increasing the blue lamp’s brightness changes blue photons into red photons. Explain why increasing the brightness at the same wavelength does not change the photon energy.
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