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Reading Two Coatings After the Lamp Turns Off 4 questions
Reading Two Coatings After the Lamp Turns Off
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A museum tests two coatings for a temporary display label. Each stores some energy from a lamp and emits light after the lamp turns off. The graph shows light measured after matched lamp exposures. A coating must give at least 5 units at 4 minutes and at most 2 units at 8 minutes.
Question 1
Which coating meets both requirements in the recorded tests?
- P only
- Q only
- Both coatings
- Neither coating
Question 2
A student says the equal readings at the moment the lamp turns off prove the labels will stay equally bright. Evaluate the claim using a later time.
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A second exhibit requires at least 5 units at 6 minutes and at most 1 unit at 8 minutes. The lamp exposure remains unchanged.
Question 3
Use both criteria to decide whether either coating works for the second exhibit.
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Question 4
The team considers a different lamp exposure for P. Identify the two post-lamp readings it must compare with the second exhibit’s requirements.
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