what is basic properties of thermal radiation?
Answers
HERE IS YOUR ANSWER :-
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❄ BASIC PROPERTIES OF THERMAL RADIATION :-
✨ THEY TRAVEL ALONG A STRAIGHT LINES WITH THE SPEED OF LIGHT.
✨ THEY REQUIRE NO MEDIUM FOR THEIR PROPAGATION.
✨ THEY DO NOT HEAT THE INTERVENING MEDIUM THROUGH WHICH DAY PASS.
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Answer:
Radiation is the mode of heat transfer or in general,
energy transfer by electromagnetic waves/quanta.
Thermal radiation or heat radiation is the radiation
produced by thermal agitation of the particles ofa
body, and its spectrum, ie., frequency distribution
or wavelength distribution, is continuous from the far infrared to the extreme ultraviolet region
depending on the temperature of the body.
Properties
(1) Thermal radiations are electromagnetic waves/
quanta extending from the far infrared to the ex
treme ultraviolet region. In this spectrum, the in-
frared waves (wavelengths ranging from about 700
nm to about 1 mm) are sensed as heat.
(2) They have the same speed in free space as that of
light, nearly 3 x 10 m/s, which makes radia-tion
the most rapid mode of heat transfer
(3) They exhibit all the optical phenomena of light, viz,
reflection, absorption, refraction, interference, dif-
fraction and polarization.
(4) Radiation incident on a body is, in general, partly
reflected, partly absorbed and partly transmitted.
(5) Thermal radiation obeys the inverse-square law of
intensity, ie., the intensity at a point is inversely
proportional to the square of its distance from a
point source of radiation.