APFIVE In an attempt to demonstrate the greenhouse effect, a student constructed two identical, sealed boxes, placing a thermometer inside each. One box was filled with carbon dioxide (CO2), and the other with nitrogen (N2). Both boxes were then placed under a heat lamp. After several hours, the student observed that the temperature inside both boxes had increased by the same amount. The student expected the box with CO2 to show a higher temperature increase due to CO2’s role as a greenhouse gas. What was the conceptual mistake in the student’s experimental design?
The boxes were sealed too tightly, preventing any heat from escaping and thus equalizing the temperature in both boxes.
The student did not account for the fact that the greenhouse effect requires sunlight’s full spectrum, not just heat from a lamp, to be demonstrated effectively.
The concentration of CO2 used was too low to show a measurable difference in temperature increase compared to nitrogen.
The thermometers used were not sensitive enough to detect the slight temperature difference expected between the two gases.
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