Passage I

Io, one of Jupiter's moons, was studied with 2 spacecraft instruments that can detect visible radiation or thermal infrared (TIR) radiation (sec Table 1).

The instruments located volcanic regions called hot spots on Io. Hot spots are areas where molten material at or above 400 K is ejected. Three studies of Io's hot spots were performed.

Study 1

The instrument on the spacecraft orbiting Io recorded the locations of all hot spots. Figure 1 show the latitudes of those hot spots in both hemispheres.

Study 2

The intensity of the of emitted radiation from each hot spot was used to estimate the hot spot's area and average temperature. The hot spots were grouped into 2 categories: Type Ⅰ hot spots having average temperatures below 500 K and Type Ⅱ hot spots having average temperatures above 500 K. Type II hot spots emit higher intensity radiation than do Type l hot spots. The results for 10 hot spots are shown in Table 2.

Study 3

Scientists believe that each of Io's hot spots ejects 1 of 3 types of molten material: molten sulfur, material similar in composition to basalt lava, or material similar in composition to ultramafic lava. Basalt lava and ultramafic lava have been ejected from Earth's volcanoes. Table 3 gives the melting point of sulfur and the 2 types of lava, and the boiling point of sulfur, all at a pressure of 1 atmo­sphere (atm).

5. Another hot spot, which had an estimated average temperature of 1, 350 K, was discovered on Io. Based on the results of Study 2, the estimated area of this newly discovered hot spot would be:

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

Looking at table 2, the temperature of Type II hot spots is above 1000 K, so it is judged that the hot spot in the stem also belongs to type II;

And it can be seen from the table that the higher the temperature , the smaller the area, so 1350 is between 1274 and 1525, then its area should be between 0.02 and 0.58