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AP® Physics 1 & 2

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Thermal Conduction: Aluminum Block in Freezer

APPH12-NGK4WY

A small solid aluminum block is immersed in a pool of liquid nitrogen (-196°C). The block is then removed from the pool of liquid nitrogen and placed in a household freezer (-18°C).

Which one of the following statements correctly describes the transfer of energy between the aluminum block and the air in the freezer?

A

Through molecular collisions, kinetic energy is transferred from the faster moving air molecules to the slower moving aluminum block molecules.

B

The cold energy of the aluminum block is so intense that is lowers the freezer air to a temperature less than -196°C.

C

The molecules in the aluminum block are moving so violently after being in the liquid nitrogen that they collide and transfer kinetic energy to the slower air molecules in the freezer.

D

Since both the air in the freezer and the aluminum block are below 0°C, there is no transfer of kinetic energy.