Advertisements
Advertisements
Question
Explain briefly the process of heat transfer by radiation.
Advertisements
Solution
RADIATION. “The transfer of heat energy from a hot body to cold body directly, without heating the medium between two bodies is called RADIATION.”
The radiant heat or thermal radiation is of the form of ELECTROMAGNETIC WAVES. These waves can travel even in vacuum in all directions in straight line with the speed of light. They do not heat the medium through which they pass. Heat radiations are also called INFRA-RED RADIATIONS because the wavelength of heat radiations is longer than that of visible light. These radiations can cause heating effect only if they are absorbed by some material
APPEARS IN
RELATED QUESTIONS
A wooden spoon is dipped in a cup of ice cream. Its other end ______.
Select the correct alternative
In the process of convection, heat travel
Select the correct alternative
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
State the direction of heat transfer by way of convection.
Maximum heat is absorbed by a ______ coloured object.
How does a fever get lowered by putting a cold compress on the forehead of a patient?
What are the modes of heat transfer?
Explain which mode of heat transfer causes sea breezes and land breezes.
The handles of cooking utensils are made of ______.
Take two similar transparent glass bottles having wide mouths. Put a few crystals of potassium permanganate or pour a few drops of ink in one bottle. Fill this bottle with hot water. Fill the other bottle with cold water. Cover the cold water bottle with a thick piece of paper such as a postcard. Press the postcard firmly with one hand and hold the bottle with the other hand. Invert the bottle and place it on top of the hot water bottle. Hold both the bottles firmly. Ask some other person to pull the postcard. Observe what happens. Explain.
