Question 1
Multiple choiceEasy1 markA region of Earth is measured twice. Its albedo is unchanged between measurements; the incident and scattered powers are shown. Which row gives the albedo and the scattered power in the later measurement, respectively?
| Measurement | Incident power / W | Scattered power / W |
|---|---|---|
| First | 600 | 150 |
| Later | 1200 | — |
Show answer and explanation
Answer: D. Albedo is total scattered power divided by total incident power. The first measurement gives With albedo unchanged, the later scattered power is
A: Keeps the initial scattered power instead of scaling it for the increased incident power.
B: Adds scattered power to incident power in the denominator, giving an albedo of
C: Uses the non-scattered fraction, as the albedo.
Remember: multiply incident power by albedo to find scattered power.