Select the option that shows the correct order for the speed of heat transfer by conduction, convection, and radiation.

Options

A. Conduction` rarr `Convection` rarr `Radiation
B. Convection `rarr` Conduction `rarr` Radiation
C. Radiation `rarr` Conduction` rarr` Convection
D. Radiation `rarr` Convection `rarr `Conduction

Answer

To determine the correct order for the speed of heat transfer by conduction, convection, and radiation, we can analyze each method of heat transfer:

1. **Conduction**: This is the process where heat is transferred through direct contact between materials. The heat moves from one particle to another, and this process is relatively slow because it relies on the vibration and movement of particles in a solid.

2. **Convection**: This method occurs in fluids (liquids and gases) where the warmer parts of the fluid rise and the cooler parts sink, creating a circulation pattern. While convection is faster than conduction, it is still slower than radiation because it involves the movement of the fluid itself.

3. **Radiation**: This is the transfer of heat in the form of electromagnetic waves, such as infrared radiation. Radiation does not require a medium (like air or water) to transfer heat, and it travels at the speed of light, making it the fastest mode of heat transfer.

Now, putting these together, we can establish the order from fastest to slowest:

- **Radiation** (fastest)
- **Convection**
- **Conduction** (slowest)

Thus, the correct order for the speed of heat transfer is: **Radiation > Convection > Conduction**.