Question

What is the approximate average Albedo of the Earth?

• A. 0.1
• B. 0.3
• C. 0.5
• D. 0.7

Hint:

\textbf{Earth's albedo ≈ 0.3 (30% reflected, 70% absorbed)}.

Answer 1

The Correct Option is B

Concept: Albedo is the fraction of incoming solar radiation that is reflected back into space by the Earth's surface and atmosphere.
Step 1: Understanding albedo.
It ranges from 0 (no reflection) to 1 (total reflection).
Step 2: Average value of Earth's albedo.
The Earth reflects about 30% of incoming solar radiation. \[ \text{Albedo} \approx 0.3 \]
Step 3: Eliminating incorrect options.

• 0.1 is too low.
• 0.5 and 0.7 are unrealistically high for Earth.

Conclusion:
Thus, the correct answer is \( \boxed{0.3} \).