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What are the differences and similarities between radiation and conduction?

Question 1 options:

Radiation involves heat rising, but conduction involves direct contact.

Conduction occurs in liquids and gases. Radiation occurs in rays, waves, and particles.

Both are types of heat transfer. Radiation occurs in all directions thru empty space. Conduction occurs in solids and liquids and must touch.

Question 2 (3 points)

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Explain the difference between conduction and convection.

Question 2 options:

Heat rises for convection and travels thru liquids and gases. Conduction travels thru solids and liquids but must be touching.

Thermal energy travels thru solids for both conduction and convection; however, conduction involves direct contact.

Heat moves in all directions for convection, but it rises for conduction.

Conduction involves heat going in all directions while heat rises with convection.

Question 3 (10 points)

Answer 1

Question 1: Differences and Similarities Between Radiation and Conduction

Correct Answer: Both are types of heat transfer. Radiation occurs in all directions through empty space. Conduction occurs in solids and liquids and must touch.

Explanation:

• Similarities:

  • Both radiation and conduction are methods of heat transfer.

• Differences:

  • Radiation: Transfers heat through electromagnetic waves and can occur in the absence of a medium (e.g., through a vacuum). It moves in all directions.
  • Conduction: Transfers heat through direct contact between materials. It occurs primarily in solids and liquids, where particles are in close proximity.

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Question 2: Difference Between Conduction and Convection

Correct Answer: Heat rises for convection and travels through liquids and gases. Conduction travels through solids and liquids but must be touching.

Explanation:

• Convection: Involves the movement of heat through fluids (liquids and gases) driven by the temperature differences that cause density variations. As warm fluid rises and cool fluid sinks, heat energy is transferred throughout the fluid.

• Conduction: Involves heat transfer through direct contact between materials. It can occur in solids and, to a lesser extent, in liquids, but the materials must be in contact for conduction to take place.