Question

Unit 2 & 3: Energy Test
20 of 2520 of 25 Items



























































Question
Possible Points: 1
Consider the following experimental setup in which an experimenter is heating a metal band at its center with a burner.

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Which of the following investigations correctly explains heat transfer through the metal band?

Responses

Radiation transfers heat energy through the metal band. The metal ions in the bottom layer are in contact with the burner. The burner is at a very high temperature, and it emits thermal energy in space in the form of infrared radiation.
Radiation transfers heat energy through the metal band. The metal ions in the bottom layer are in contact with the burner. The burner is at a very high temperature, and it emits thermal energy in space in the form of infrared radiation.

Conduction and radiation transfer heat energy through the metal band. From the burner, the metal ions at the bottom of the layer receive heat energy through infrared radiation. Then, the heat energy transfers from the hot end to the cold end of the metal band by conduction.
Conduction and radiation transfer heat energy through the metal band. From the burner, the metal ions at the bottom of the layer receive heat energy through infrared radiation. Then, the heat energy transfers from the hot end to the cold end of the metal band by conduction.

Convection transfers heat energy through the metal band. The metal ions in contact with the heat energy from the burner gain lot of kinetic energy; therefore, they expand and move upward through the crystal to reach the surface. At the same time, the surface molecules are having less kinetic energy and are more compact, so they are pushed downward. This causes a sort of convection current in the crystal structure of the metal.
Convection transfers heat energy through the metal band. The metal ions in contact with the heat energy from the burner gain lot of kinetic energy; therefore, they expand and move upward through the crystal to reach the surface. At the same time, the surface molecules are having less kinetic energy and are more compact, so they are pushed downward. This causes a sort of convection current in the crystal structure of the metal.

Conduction transfers heat energy through the metal band. With the supply of heat energy, the closely-packed metal ions gain kinetic energy and vibrate about their mean positions. At the same time, the free electrons transfer this excessive kinetic energy from the hot end to the cold end of the metal band. Free electrons transfer the energy as they collide with ions moving through the lattice.

Answer 1

The correct investigation that explains heat transfer through the metal band in this scenario is:

**Conduction transfers heat energy through the metal band. With the supply of heat energy, the closely-packed metal ions gain kinetic energy and vibrate about their mean positions. At the same time, the free electrons transfer this excessive kinetic energy from the hot end to the cold end of the metal band. Free electrons transfer the energy as they collide with ions moving through the lattice.**

This response accurately describes how heat is transferred in metals. In metals, heat transfer occurs primarily through conduction, where the metal ions vibrate and free electrons carry energy from the hotter region (where the burner is applied) to the cooler region. Convection is not applicable here because it typically involves the movement of fluid (liquids or gases), and the context of the question pertains to a solid metal band. Radiation is also involved in heat transfer from the burner, but the main mechanism in the metal itself is conduction.