Question

Stefan Boltzmann Law is related to:

• A. Conductive heat transfer
• B. Boiling heat transfer
• C. Convective heat transfer
• D. Radiative heat transfer

Hint:

The Stefan-Boltzmann Law governs radiation heat transfer and states that the thermal radiation emitted by an object is proportional to $T^4$, where $T$ is the absolute temperature in Kelvin.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Heat transfer occurs via three primary mechanisms: conduction, convection, and radiation.
Radiation is the transfer of heat through electromagnetic waves and does not require a physical medium.

Step 2: Detailed Explanation:
The Stefan-Boltzmann Law describes the total energy radiated per unit surface area of a black body across all wavelengths per unit time.
The law states that the total emissive power ($E$) of a black body is directly proportional to the fourth power of its absolute temperature ($T$):
\[ E = \sigma T^4 \]
Where $\sigma$ is the Stefan-Boltzmann constant ($5.67 \times 10^{-8}\text{ W/m}^2\text{K}^4$).
For real surfaces, the equation is modified using the emissivity ($\epsilon$) of the material:
\[ E = \epsilon \sigma T^4 \]
This law is a fundamental principle of Radiative heat transfer.
Conduction is governed by Fourier's Law, and convection is described by Newton's Law of Cooling.
Therefore, the Stefan-Boltzmann law is related to radiative heat transfer.

Step 3: Final Answer
The correct option is (D).