Unit Test — Unit test Answers

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Which two conditions must exist in order for radiation to occur?

the presence of a solid, liquid, or gas and a temperature difference

direct contact of molecules and the presence of a solid, liquid, or gas

the presence of electromagnetic waves and direct contact of molecules

a temperature difference and the presence of electromagnetic waves

Val warms up some soup on the stove. Assuming no phase change has occurred, what effect does warming have on the soup?

Its particles have less kinetic energy.

Its particles have more kinetic energy.

Its specific heat increases.

Its specific heat decreases.

The diagram shows a closed system before and after heat is added to it.

Kinetic energy within the system decreases and creates mechanical energy as the piston moves upward.

Kinetic energy within the system increases and is transformed into mechanical energy as the piston moves upward.

Mechanical energy within the system increases and is transformed into kinetic energy as the piston moves upward.

Mechanical energy within the system decreases and creates kinetic energy as the piston moves upward.

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