# Heat Flow

1. Mar 12, 2009

### dcramps

1. The problem statement, all variables and given/known data
Which one of the following statements about heat flow is FALSE?
(A) Thermal conduction is due to energy exchange during collisions of atoms or molecules.
(B) Thermal convection occurs only in fluids.
(C) The rate of heat flow due to thermal radiation is proportional to the fourth power of the temperature in oC.
(D) A perfect emitter of thermal radiation has an emissivity of one.
(E) The rate of heat loss due to thermal conduction is proportional to the temperature change in oC

2. Relevant equations
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3. The attempt at a solution

I know A, B, and C are true. D & E I am not so sure.

D - I believe this is true - a perfect blackbody has an emissivity of one. A blackbody is an emitter of thermal radiation, correct?
E - Uhm..false?

2. Mar 13, 2009

### Mapes

What is the equation for radiative heat transfer between two bodies?