Radiation heat transfer is characterized by
EM waves is characterized by radiant heat transfer.
Which is true regarding radiation?
It is true that radiation travels in medium or without medium.
Radiation exchange occurs in
It occurs more effectively only in vacuum.
Energy released by a radiating surface is not continuous but is in the form of successive and separate packets of energy called
The photons are propagated through space as rays.
The electromagnetic waves are emitted as a result of
(i) Vibrational movement
(ii) Rotational movement
(iii)Atomic or sub-atomic particles comprising the matter
Identify the correct statement
The emission occurs when the body is excited by an oscillating electrical signal.
Thermal radiations occur in the portion of electromagnetic spectrum between the wavelengths
The radiation waves propagates with the speed of light, and their wavelength ranges from 0.1 to 100 micron meter.
A perfectly black body
A black body is a perfect emitter and absorber.
What is the wavelength band for cosmic rays?
This is its maximum wavelength.
For a prescribed wavelength a black body radiates how much energy at the temperature of body?
A black body neither reflects nor transmits any amount of incident radiations.
“Radiation emitted by a black surface is a function of wavelength and temperature but is independent of direction”. Choose the correct answer
The black body is a diffused emitter.