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Checking a Solid That Conducts Under Light 4 questions
Checking a Solid That Conducts Under Light
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display tests a solid strip between metal contacts. The strip stays at the same temperature and voltage during the readings. The exhibit has an independent sensor that estimates how many electrons in the strip can move through it. Atoms stay in place in this model.
| Condition | Current (model units) | Mobile-electron reading (model units) |
|---|---|---|
| In darkness | 0 | 0 |
| Under light P | 6 | 12 |
| Under light Q | 0 | 0 |
| In darkness after light P | 0 | 0 |
Question 1
Which condition provides evidence of mobile charge in the solid strip?
- Darkness before either light
- Light P
- Light Q
- Darkness after P
Question 2
Use both sensors to explain why a solid can carry current during light P even with its atoms fixed.
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Question 3
A student says light P must melt the strip to make it conduct. Select whether the readings support or refute the claim. Use the stated conditions and the sensor record.
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In another run, the display turns on a second light that delivers the same energy per second as P but does not make electrons mobile.
Question 4
Predict the current in this run. Explain why the energy-per-second reading alone is insufficient.
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