PSAT Reading Question 660: Answer and Explanation

Question: 660

Based on the information in the passage and in the table, light visible to humans would have wavelengths between which two types of waves?

• A. Gamma and X-rays
• B. X-rays and ultraviolet
• C. Ultraviolet and infrared
• D. Infrared and radio

Correct Answer: C

Explanation:

(C) Lines 47–52 state that humans are able to see wavelengths between 400 and 700 nanometers. A nanometer is 1 × 10^–9 meters. So the visible wavelengths fall between the ultraviolet and infrared wavelengths.