Question

Write any two properties of thermal radiation.

Answer 1

Hint: First let us see what thermal radiation is:
Thermal radiation is electromagnetic radiation produced by the warm movement of particles. All with a temperature more than absolute zero transmits thermal radiation. Particle movement brings about charge-acceleration or dipole swing which produces electromagnetic radiation
Thermal radiation is administered by the two laws: Hotter objects emanate light with a more limited wavelength and a higher frequency. Hotter things produce light having more brightness.

Complete step by step answer:The properties of thermal radiation are:
Thermal radiation transmitted by a body at any temperature comprises a wide scope of frequencies. The frequency distribution is given by Planck's law of dark body radiation for an ideal source.
The predominant frequency (or colour) scope of the transmitted radiation movements to higher frequencies as the temperature of the producer increments. For instance, an intensely hot item emanates for the most part in the long frequencies (red and orange) of the noticeable band. On the off chance that it is warmed further, it likewise starts to discharge perceivable measures of green and blue light, and the spread of frequencies in the whole obvious reach causes it to seem white to the natural eye; it is white hot. Notwithstanding, even at a white-hot temperature of $2000\,k,\,99\% $ of the energy of the radiation is still in the infrared. This is controlled by Wien's displacement law.

Note:The pace of electromagnetic radiation transmitted at a given frequency is relative to the measure of absorption that it would face by the source. Hence, a surface that retains more red lights thermally transmits more red lights.