Question 10 Answer and Explanation _ACT April 2012 Form 70G Science Section

10. Consider the ultraviolet radiation that reached the location in Antarctica on September 15, 2000, on October 15, 2000, and on November 15, 2000, after having passed through the stratosphere. Based on Figure 2, on which of the 3 dates was the intensity of the radiation greatest?

F. September 15, because the ${O}_{3}$ partial pressure averaged over the altitudes from 16 km to 26 km was the least on that date.

G. October 15, because the

partial pressure averaged over the altitudes from 16 km to 26 km was the greatest on that date,

H. October 15, because the

partial pressure averaged over the altitudes from 16 km to 26 km was the least on that date.

J. November 15, because the

partial pressure averaged over the altitudes from 16 km to 26 km was the greatest on that date.

Answer and Explanation

Your Answer is

Correct Answer is H

Explanation

Intensity of radiation greatest means that O₃ is the least (O₃ is less, there will be more ultraviolet radiation reaching the surface of the earth), that is, O₃ The partial pressure is the lowest.

Look at the three curves in figure 2, the Oct. 15th represented by the short dashed line is the one with the smallest abscissa