Pasco TD-8497 Solar Constant Manuel d'utilisateur télécharger pdf (Page 9)

Solar Constant Model No. TD-8497

For Further Study:

1. Repeat the experiment with the three black cylinders.

2. Calculate the intensity, I, for all three cylinders. The heavier small black cylinder is made

of brass. Did you record about the same intensity value for all three cylinders?

3. Look at the equilibrium temperature that each cylinder reaches. Why aren't the equilibria

the same, in view of your answer from question (2)?

Teacher’s Notes

Shown below are typical heating rates of three aluminum cylinders with three different

surfaces. Notice that both the heating rate and final temperature are largest for the black

cylinder. The white cylinder clearly is the coolest at the final temperature. The slope on the

graph is in degrees C/second, even though the axis is displayed in minutes. This data was

taken in California during the summer around noon. The ambient temperature was measured

with a Fast Response Temperature Probe, and thus the fluctuations there are real, due to very

small air currents around the building. Also notice the small dip in all three temperatures at

about 16 minutes, due to a small cloud that drifted by!

Heating Rates of Three Aluminum Cylinders with Different Surfaces

1 2 3 4 5 6 7 8 9 10 11

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Pasco TD-8497 Solar Constant Manuel d'utilisateur Page 9