Most of the radiation emitted by the Sun is in the ultraviolet.

Question

BlackTom AI · Accepted Answer

Question restatement: The statement asks whether the Sun emits most of its radiation in the ultraviolet region. Answer options: True or False.
Option 1: True. This claim is not supported by the physics of blackbody radiation for a Sun-like temperature. A blackbody at about 5800 K emits energy across a spectrum peaking in the visible range (roughly around 500 nm, the green part of the spectrum). Ultraviolet radiation represents only a small tail of the distribution, not the majority, so labeling UV as the main output is incorrect.
Option 2: False. This is the accurate assessment. The Sun’s emission peaks in the visible part of the spectrum, with substantial energy also in the infrared. Ultraviolet constitutes a relatively small fraction of the total energy output, and while some UV does reach Earth, much of it is absorbed by the atmosphere, further reducing its share of the Sun’s radiation that actually reaches the surface. The overall energy distribution is dominated by visible light, not UV.
Summary of why the True choice is incorrect: it misrepresents the spectral peak and portion of energy in UV; misinterprets the Sun’s emission profile according to blackbody radiation at solar temperature.
Summary of why the False choice is correct: it correctly reflects that the majority of solar radiation lies in the visible (with substantial infrared), and UV is only a minor component of the Sun’s output.

CLMTGR5001_002_2025_3 - Dynamics of Climate Variability and Chan Midterm Group A (Secure Browser)

Most of the radiation emitted by the Sun is in the ultraviolet.

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