Question at position 24 What percentage of the Sun's energy that reaches Earth is reflected (as visible light) back into space? 6603095单项选择题
A
66
B
0
C
30
D
95

Question

Question at position 24 What percentage of the Sun's energy that reaches Earth is reflected (as visible light) back into space? 6603095

BlackTom AI · Accepted Answer

The question asks about the fraction of sunlight that Earth reflects back into space in the visible spectrum. 
Option 66: This is too high for the planet’s average albedo in visible light. Earth’s overall albedo is commonly cited around 0.30, not near two-thirds of incoming light. 
Option 0: Saying 0% would imply Earth reflects nothing, which is false since Earth clearly appears bright from space and has measurable reflectivity due to clouds, ice, and deserts. 
Option 30: This matches the well-established Earth albedo value of about 0.30 in visible light, meaning roughly 30% of the Sun’s energy reaching Earth is reflected back to space. 
Option 95: A 95% reflectivity is far higher than observed for Earth in the visible spectrum; such a value would imply an almost mirror-like planet, which is not the case. 
In summary, among the given choices, 30% is the widely accepted estimate for the fraction of visible light reflected by Earth back into space, corresponding to its average albedo.

Question at position 24 What percentage of the Sun's energy that reaches Earth is reflected (as visible light) back into space? 6603095单项选择题

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