Discussion
Match the sections of electromagnetic spectrum (List-I) with their percentage representation in the energy emitted by sun (List-II)
| List-I | List-II |
|---|---|
| (a) X-rays, Gamma-rays & radio waves region | (i) 43 |
| (b) Visible region | (ii) 7 |
| (c) Near infrared region | (iii) less than 1 |
| (d) Ultraviolet region | (iv) 49 |
Answer: B
The correct match is a-iii, b-i, c-iv, d-ii.
The Sun radiates almost like a black body at about 5,800 K, so its output peaks in the visible. The share of its energy by region, as given in remote sensing and climatology texts, is:
| Region | Share |
|---|---|
| X-rays, gamma rays, radio | less than 1% |
| Visible | 43% |
| Near infrared | 49% |
| Ultraviolet | 7% |
All four options agree on (a). The others go wrong by giving visible light 49% or 7%, or by giving the near infrared 43% or 7%; ultraviolet is a small share, not 43 or 49%.
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