Which of the following is generally considered as opaque surface towards radiations ?
Correct answer: A. Both B. and C.
- A. Both B. and C.
- B. Solids
- C. Liquids
- D. Gases
Explanation
Solids and most liquids absorb or reflect thermal radiation rather than transmitting it, so they are generally treated as opaque. Gases are commonly regarded as transparent or participating only weakly in radiation.
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