The total emissivity power is defined as the total amount of radiation emitted by a black body per unit
A. Temperature
B. Thickness
C. Area
D. Time
Answer: Option C
Solution (By Examveda Team)
Total emissive power refers to the total amount of thermal radiation emitted by a surface (typically a black body) across all wavelengths per unit time and per unit area.This concept is governed by Stefan-Boltzmann law, which states:
E = σT⁴
Where:
E = Total emissive power
σ = Stefan-Boltzmann constant
T = Absolute temperature of the black body
As per the definition, the total emissive power is expressed in units of watts per square meter (W/m²), indicating that it is radiation emitted per unit area.
Therefore, the correct answer is: Area (Option C).
This Question Belongs to Mechanical Engineering >> Heat And Mass Transfer
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