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प्रश्न
Why is the outer coat of the penguins of Antarctica black?
उत्तर
Black is a good absorber or trapper of heat. So, in cold regions like Antarctica, the black outer coating of penguins helps them to absorb as much heat from the surroundings and keep their bodies warm.
संबंधित प्रश्न
Look at Figure. Mark where the heat is being transferred by conduction, by convection and by radiation.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Fill in the blank
A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________
Select the correct alternative
In the process of convection, heat travel
Explain briefly the process of heat transfer by radiation.
Give one example of heat transfer by radiation.
______ of heat does not require a medium.
Conduction of heat takes place through a ______ substance.
Explain which mode of heat transfer causes sea breezes and land breezes.
Take a sheet of paper. Draw a spiral on it as shown in Figure. Cut out the paper along the line. Suspend the paper as shown in Figure above a lighted candle. Observe what happens. Think of an explanation.
