Passage III
A mercury thermometer, at an initial temperature of 20°C, was placed in 30°C water, and the temperature registered by the thermometer was recorded over time. This procedure was repeated using water samples at 40°C and 50°C (see Figure 1). Next, the same thermometer, at an initial temperature of 50°C, was placed in an air sample at 20°C, and the temperature registered by the thermometer was recorded over time. This procedure was repeated using air samples at 30℃ and 40℃ (see Figure 2).
(Note: Assume that the designated temperatures of the water samples and air samples did not change during the measurements.)
14. According to Figure 2, for an air temperature of 20℃, over which of the following time intervals was the thermometer reading changing most rapidly?
Your Answer is
Correct Answer is F
Explanation
Look at figure 2, pay attention to the line of air temperature 20°C, the stage with the fastest temperature change (largest slope) corresponds to the abscissa 0-100 sec