Emissivity of a white polished body in comparison to a black body is
A. Higher
B. Lower
C. Same
D. Depends upon the shape of body
Answer: Option B
Solution(By Examveda Team)
White body reflects all incident radiation;i.e., its absorptivity is zero.
Accordingly, its emissivity is also zero.
So any black or even "grey" body will have a higher emissivity,
This Question Belongs to Mechanical Engineering >> Heat And Mass Transfer
Related Questions on Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in
A. Melting of ice
B. Boiler furnaces
C. Condensation of steam in condenser
D. None of these
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
A. Electric heater
B. Steam condenser
C. Boiler
D. Refrigerator condenser coils
The radiation emitted by a black body is known as
A. Black radiation
B. Full radiation
C. Total radiation
D. All of these
Join The Discussion