Which of the following statements about radiant heat is/are not correct?
I. radiant heat cannot travel through a vacuum
II. rough surfaces emit radiant heat more than polished surfaces
III. Dark surfaces absorb radiant heat more than bright surfaces
I only
II only
III only
I & II only
II & III only
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Discussions (22)
To determine which statement(s) about radiant heat is/are not correct, let's analyze each statement:
I. Radiant heat cannot travel through a vacuum.
This statement is incorrect. Radiant heat, also known as electromagnetic radiation, can travel through a vacuum. In fact, radiant heat travels best through a vacuum since there are no particles to absorb or scatter the radiation.
II. Rough surfaces emit radiant heat more than polished surfaces.
This statement is correct. Rough surfaces have a higher emissivity, which means they are more efficient at emitting radiant heat compared to polished or smooth surfaces.
III. Dark surfaces absorb radiant heat more than bright surfaces.
This statement is also correct. Dark surfaces have a higher absorptivity, which means they absorb more radiant heat compared to lighter or brighter surfaces.
Therefore, the only statement that is not correct is statement I: "Radiant heat cannot travel through a vacuum."
The correct answer is A. I only.
THE ANSWER IS CORRECT!!! all the people that commented above did not pay attention to the question. the question states which are NOT correct
The option chosen is wrong. Radiant heat can travel through vacuum. The correct answer is D.
i disagree.
iii) is also correct cos dark surface absorb mre heat than bryt surface.dats y wen we put on black cloth or paint a house black,d heat is usually intense
The 3 modes of heat transfer are construction, convention and radiation (also know as radiant energy). The first two modes of heat transfer require material medium for their transfer while radiant energy can travel through vacuum. This explains why heat energy from the sun can reach. Shiny and polished surfaces are slow to absorb or reflect radiant energy. But dark or black surfaces absorb radiant energy easily.
