15 Questions
What is the main characteristic of thermal radiation?
Transfers heat without heating the medium
Which statement is true about the properties of thermal radiation?
Travels through empty space with the velocity of light
Why is a perfectly black body called perfect absorber and perfect radiator?
It absorbs all radiation and emits radiations of all possible wavelengths
What type of radiation is thermal radiation in terms of wavelength?
Infrared radiation
According to Kirchhoff's Law, what is the relationship between emissive power and absorptive power for a given wavelength and temperature?
They are equal
What happens to the energy that is not absorbed by the surface in the described scenario?
It is reflected or transmitted
In the equilibrium state, what is the relationship between absorptive power and emissive power?
Absorptive power equals emissive power
What characteristic of the hole 'O' allows it to act as a black body radiator in the scenario described?
It has a blackened concave diaphragm limiting radiation
Which law describes the relation between energy density and wavelength for shorter wavelengths?
Wien's Law
In the context of the text, what happens when e λT ≫ 1?
Equation (1) simplifies to Wien's Law
Which law applies to the relation between energy density and wavelength for longer wavelengths?
Rayleigh-Jean's Law
How is the value of the constant described in the text in CGS units?
5.672x10-5 erg / (cm2K4sec)
What instrument was used to measure the black body's temperature according to the text?
Thermocouple
What happens to the intensity of heat radiation as the wavelength increases?
Increases and then decreases
How is the energy distribution in the radiation spectrum of a black body characterized according to the text?
Not uniformly distributed
Learn about the distribution of energy in a black body spectrum and the units used to measure constant values in CGS and MKS systems. Explore how Lummer and Pringsheim studied the distribution of energy among radiation emitted by a black body at different temperatures.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
