
What is black body radiation? Explain the characteristics of it.
Answer
407.7k+ views
1 likes
Hint: A black body is an idealized object that absorbs all electromagnetic radiation it comes in contact with. It then emits the absorbed radiation as thermal radiation in a continuous spectrum according to its temperature. It follows certain laws when it emits thermal radiation.
Formula used:
where is the black body radiant emittance, is the Stefan-Boltzmann constant and is the thermodynamic temperature .
Complete step-by-step answer:
The radiation emitted by a black body is called black body radiation. The distribution of energy of a black body radiation at different temperatures , with its wavelength is as shown in the figure
Characteristics of a blackbody radiation spectra are:
(1) The emissive power of a blackbody , for every wavelength , increases with increasing temperature.
(2) Each curve has a characteristic form with a maximum for at a certain wavelength
(3) depends only on the absolute temperature of the blackbody and, with increasing temperature, shifts towards shorter wavelength (i.e. towards the U.V. end of the light spectrum).
(4) The area under each curve gives the total radiant power per unit area of a blackbody at that temperature and total radiation emitted is directly proportional to according to Stefan's law.
Note: The Stefan-Boltzmann constant, , is derived from other known physical constants in use. The value of the constant has been widely accepted as where is the Boltzmann constant is Planck’s constant and is the speed of light in vacuum.
Formula used:
Complete step-by-step answer:
The radiation emitted by a black body is called black body radiation. The distribution of energy of a black body radiation

Characteristics of a blackbody radiation spectra are:
(1) The emissive power of a blackbody
(2) Each curve has a characteristic form with a maximum for
(3)
(4) The area under each curve gives the total radiant power per unit area
Note: The Stefan-Boltzmann constant,
Latest Vedantu courses for you
Grade 10 | MAHARASHTRABOARD | SCHOOL | English
Vedantu 10 Maharashtra Pro Lite (2025-26)
School Full course for MAHARASHTRABOARD students
₹31,500 per year
Recently Updated Pages
Express the following as a fraction and simplify a class 7 maths CBSE

The length and width of a rectangle are in ratio of class 7 maths CBSE

The ratio of the income to the expenditure of a family class 7 maths CBSE

How do you write 025 million in scientific notatio class 7 maths CBSE

How do you convert 295 meters per second to kilometers class 7 maths CBSE

Write the following in Roman numerals 25819 class 7 maths CBSE

Trending doubts
Give 10 examples of unisexual and bisexual flowers

Draw a labelled sketch of the human eye class 12 physics CBSE

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

Differentiate between insitu conservation and exsitu class 12 biology CBSE

What are the major means of transport Explain each class 12 social science CBSE

Draw a diagram of a flower and name the parts class 12 biology ICSE
