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Difficulty: MediumHeat Transfer: Radiation

Match each physical scenario or material choice with its corresponding principle of thermal radiation.

  • Highly polished aluminum shield near a hot engineReflects radiant heat to protect adjacent components
  • Matte black coating on a satellite radiator panelMaximizes the emission of thermal energy into space
  • Complete vacuum between the Earth and the SunPermits heat transfer exclusively via electromagnetic waves
  • Glossy white paint on an outdoor fuel storage tankMinimizes the absorption of incoming solar radiation

Answer

Highly polished aluminum shield matches with reflecting radiant heat; Matte black coating matches with maximizing emission; Vacuum matches with exclusive electromagnetic transfer; Glossy white paint matches with minimizing solar absorption.
Each scenario correctly pairs a physical characteristic (surface color, finish, or presence of a vacuum) with its mechanical consequence regarding the absorption, reflection, or transmission of thermal radiation.

Step-by-Step Solution

1
Analyze the thermal properties of a highly polished aluminum shield.
Shiny, smooth metals reflect most incoming radiation.
To match it with its function of protecting adjacent components by reflecting heat.
2
Evaluate the thermal behavior of a matte black surface in a vacuum.
Dark, dull surfaces are excellent emitters of radiation.
To match the satellite panel with its primary purpose of maximizing heat emission into space.
3
Consider the mechanism of heat transfer through a complete vacuum.
Only radiation (electromagnetic waves) can travel without a physical medium.
To match the Earth-Sun vacuum with the fact that it permits transfer exclusively via electromagnetic waves.
4
Determine the thermal effect of glossy white paint on a storage tank exposed to the sun.
White surfaces reflect visible light and effectively reduce heat absorption.
To match the white paint with the minimization of incoming solar radiation absorption.

Key Concept

Surface finish and color dictate how materials reflect, absorb, and emit thermal radiation, which travels via electromagnetic waves and can propagate through a vacuum.
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Topics

Heat Transfer: Radiation

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