Research Summary 2025

Based on the data in Figure 2, the transmittance at 0.31 microns at a concentration of 18 mg/m³ would most likely be:

• less than 45%.

• between 45 and 50%.

• between 50 and 55%.

• greater than 55%.

In Study 2, as the concentration of ozone increased from 3 to 24 mg/m³, the transmittance at 0.31 microns:

• increased only.

• decreased only.

• increased and then decreased.

• decreased and then increased.

Based on the model in Study 2, which of the locations in Study 3 likely has the greatest transmittance at 0.31 microns?

• Location 1

• Location 2

• Location 3

• Location 4

According to the passage, which of the following pairs of equations represents the production of ozone in the stratosphere?

• 
• 
• 
• 

The researcher plans to repeat Study 2, but this time he wants to study the effects on transmittance of different CO₂ concentrations instead of O₃ concentrations. Based on Figure 1, should he measure the transmittance at 4.3 microns or at 9.5 microns?

• At 4.3 microns; the transmittance of CO₂ is lower at this wavelength than it is at 9.5 microns.

• At 4.3 microns; the transmittance of CO₂ is higher at this wavelength than it is at 9.5 microns.

• At 9.5 microns; the transmittance of CO₂ is lower at this wavelength than it is at 4.3 microns.

• At 9.5 microns; the transmittance of CO₂ is higher at this wavelength than it is at 4.3 microns.

Planet Z has the same atmosphere make-up as Earth, except that the concentration of carbon dioxide is higher and there is no ozone. Would the total transmittance of sunlight on Planet Z at a wavelength of 0.3 microns likely be higher or lower than the transmittance on Earth at a wavelength of 0.3 microns?

• Higher; the transmittance of CO₂ is lower than the transmittance of O₃ at 0.3 microns.

• Higher; the transmittance of CO₂ is higher than the transmittance of O₃ at 0.3 microns.

• Lower; the transmittance of CO₂ is lower than the transmittance of O₃ at 0.3 microns.

• Lower; the transmittance of CO₂ is higher than the transmittance of O₃ at 0.3 microns.

Based on Table 1, assuming that the atmospheric gases are uniformly mixed in the stratosphere, what would be the approximate mass of O₃, in grams, in 100 cubic meters of stratospheric air at Location 3 on the date of the study?

• 0.21

• 2.1

• 210

• 2.100