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Checking a Warm Surface With Two Thermometers 4 questions
Checking a Warm Surface With Two Thermometers
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A workshop checks two warm metal blocks with a contact thermometer and an infrared detector. The blocks have different surface finishes. In this model the contact thermometer measures the surface temperature directly. The infrared detector records radiation from the surface. A surface finish can change that radiation at the same temperature.
| Block | Contact reading (°C) | Infrared signal (model units) |
|---|---|---|
| P, dull finish | 60 | 12 |
| Q, shiny finish | 60 | 4 |
Question 1
Which readings show that the blocks have the same measured surface temperature?
- The two contact readings
- The two infrared readings
- P’s infrared reading and Q’s contact reading
- Neither set of readings
Question 2
A student says the smaller infrared signal shows that Q has a lower surface temperature. Evaluate the claim using the two kinds of measurements.
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The workshop puts identical dull patches on both blocks. The patches reach the blocks’ surface temperatures without changing them. The infrared detector now sees only a patch on each block.
Question 3
If the original difference came from the finish, predict the new infrared comparison and explain.
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Question 4
Describe a check that establishes whether the two blocks stayed at the same temperature during the patch trial.
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