Which of the following correctly identifies the methods of heat transfer?
A. A ‒ convection
B ‒ radiation
C ‒ conduction
B. A ‒ conduction
B ‒ radiation
C ‒ convection
C. A ‒ convection
B ‒ conduction
C ‒ radiation
D. A ‒ radiation
B ‒ convection
C ‒ conduction
The correct answer is B - conduction, radiation, and convection.
To identify the methods of heat transfer, we need to understand what each method means:
1. Conduction: In this method, heat is transferred through direct contact between objects or substances. It occurs when two objects at different temperatures come into direct contact, and the heat energy is transferred from the hotter object to the cooler object.
2. Radiation: This method involves the transfer of heat through electromagnetic waves. Heat is transferred by the emission, absorption, and transmission of electromagnetic radiation, such as infrared waves. Unlike conduction and convection, radiation does not require a medium for heat transfer and can occur even in a vacuum.
3. Convection: Here, heat is transferred through the movement of a fluid (liquid or gas). It occurs when a fluid near a heat source becomes hotter, less dense, and rises, while the cooler, denser fluid sinks. This creates a continuous circulation of heat within the fluid.
Now, let's analyze the options:
Option A: A - convection, B - radiation, C - conduction.
Option B: A - conduction, B - radiation, C - convection.
Option C: A - convection, B - conduction, C - radiation.
Option D: A - radiation, B - convection, C - conduction.
Comparing the options, we can see that only Option B correctly identifies the methods of heat transfer, with A - conduction, B - radiation, and C - convection.