Passage III
All known exoplanets (planets in orbit about stars other than the Sun) are too distant from Earth to be studied in detail, so mathematical models have been developed to help predict their properties. Figures 1-3 each show how a different property varies with altitude above the surface of Earth and above the surfaces of 2 hypothetical exoplanets: Planet X and Planet Y. Figure 1 shows how atmospheric temperature, T (in kelvins, K), varies; Figure 2 shows how atmospheric pressure, how P (in atmospheres, atm), varies; and Figure 3 shows how gravitational field strength, g (in newtons per kilogram, N/kg), varies.
20. The gravitational field strength at the surface of Planet X is approximately what percent of the gravitational field strength at the surface of Earth？
Your Answer is
Correct Answer is J
Explanation
Looking at Figure 3, when the abscissa is 0, the ordinate corresponding to Earth is about 9.8, and the ordinate corresponding to Planet X is about 8.9, so 8.9/9.8≈0.9, option J is consistent.