Location Transport

The following list contains examples claiming to represent cases of heat transfer via (i) conduction, (ii) con?

The following list contains examples claiming to represent cases of heat transfer via (i) conduction, (ii) convection and (iii) radiation. Which one is true? (a) If you heat one end of a metal rod, heat will flow down the rod to the cool end, thus heating it up. Atoms at the end of the rod where the heat is applied, start to vibrate more and more rapidly, banging into adjacent, cooler atoms, subsequently causing them to vibrate more, also. In this way, the heat works its way down the rod by convection. (b) A log fire in a fireplace heats the air around it causing a given volume of air to expand, which decreases its density. It therefore rises, being pushed upward by the surrounding, cooler and denser air, an example of heat transport by conduction. (c) Infrared photons radiate away from a hot fire. These photons carry energy directly away from the hot fire via the process of radiative transport. (d) On the morning of Apr 25, you get in your car to drive to the U to take your last exam in your Solar System class (yea!). It’s unseasonably cold and your breath freezes on the inside of your windshield. You can’t see well enough to drive, so you scrape off the coating of ice that has formed from your warm breath, which you happily realize is an example of radiation. You now proceed to class secure in the belief that you will score well on the exam. (e) You pick up a bowl that contains some oatmeal that you have cooked in a microwave and you burn the fingers on your hand, a classic example of convective transport of energy.

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1. c