Which statements about heat flow are true?

In summary, the conversation is discussing statements about heat flow and whether they are true or false. The first three statements (A, B, and C) are confirmed to be true, while the accuracy of statements D and E are uncertain. Statement D is believed to be true, as a perfect emitter of thermal radiation has an emissivity of one. Statement E is thought to be false, as the rate of heat loss due to thermal conduction is actually proportional to the temperature difference, not the change. The conversation also mentions the equation for radiative heat transfer, but it is not specified.
  • #1
dcramps
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Homework Statement


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

Homework Equations


-

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?
 
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  • #2
What is the equation for radiative heat transfer between two bodies?
 
  • #3
I know that the rate of heat loss is proportional to the temperature difference, not just the change.
 

Related to Which statements about heat flow are true?

What is thermal conduction?

Thermal conduction is the transfer of heat from a warmer object to a cooler object through direct contact. It occurs when molecules in a warmer object collide with molecules in a cooler object, transferring energy and causing the cooler object to heat up.

How does thermal conduction work?

Thermal conduction works through the transfer of kinetic energy between molecules. When molecules in a warmer object collide with molecules in a cooler object, they transfer some of their kinetic energy, causing the cooler object to heat up. This process continues until the objects reach thermal equilibrium, with both objects at the same temperature.

What is the relationship between heat loss and temperature difference?

The rate of heat loss due to thermal conduction is directly proportional to the difference in temperature between the two objects. This means that the greater the temperature difference, the faster heat will be transferred from the warmer object to the cooler object.

What factors affect the rate of heat loss due to thermal conduction?

The rate of heat loss due to thermal conduction is affected by several factors, including the thermal conductivity of the materials involved, the surface area of contact between the objects, and the thickness of the objects. Other factors such as the temperature gradient and the type of material can also impact the rate of heat loss.

How does thermal conduction differ from other forms of heat transfer?

Thermal conduction differs from other forms of heat transfer, such as convection and radiation, in that it requires direct contact between the two objects. Convection involves the transfer of heat through the movement of fluids, while radiation involves the transfer of heat through electromagnetic waves. Thermal conduction is also typically a slower process compared to convection and radiation.

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