Question

Which of the following is the best description of radiation? A. the process by which a liquid is converted to its vapor phase by heating the liquid B. heat transfer in a gas or liquid by the circulation of currents from one region to another C. the emission of energy in the form of rays or waves D. the transmission of heat through a medium without the motion of the medium

Answer 1

Heat is associated with the internal potential and kinetic energy (an apparently disorganized molecular motion) of a system.


If heat is a form of energy associated to the particles’ rotational, translational and vibratory movements, how does the heat move through the space between the Sun and the Earth, which density is extremely low? The answer is: heat could be transferred from warmed systems by radiation. The thermal radiation is electromagnetic radiation that consists of particles and waves, i.e. photons and waves, the same as visible light. Thus, the radiative heat transfer can take place through vacuum. 

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Answer 2

Answer: C

Explanation: