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प्रश्न
The earth receives heat from the sun by ______.
विकल्प
radiation
white
conduction
blue
convection
bad conductor
good conductor
black
reflection
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उत्तर
The earth receives heat from the sun by radiation.
Explanation:
Radiation is the transfer of energy through electromagnetic waves, such as light and infrared radiation. These waves travel through the vacuum of space, without the need for a medium, and reach the Earth, where they are absorbed, warming the planet.
संबंधित प्रश्न
No medium is required for transfer of heat by the process of ______.
Write true or false for a given statement.
On touching a lump of ice, we feel cold because some heat passes from our body to the ice.
Write true or false for a given statement.
Black surfaces are the poor absorbers of heat radiations.
Maximum heat is absorbed by a ______ coloured object.
What are the modes of heat transfer?
Match the items in column-I to the items in column-II
| Column-I | Column-II | ||
| 1. | Linear expansion | (a) | change in volume |
| 2. | Superficial expansion | (b) | hot body to cold body |
| 3. | Cubical expansion | (c) | 1.381 X 10-23 JK-1 |
| 4. | Cubical expansion | (d) | change in length |
| 5. | Boltzmann constant | (e) | change in area |
Heat is the transfer of energy between two objects at different temperatures.
When ice changes into a liquid, it absorbs energy.
Wrap a thin paper strip tightly around an iron rod. Try to burn the paper with candle while rotating the iron rod continuously. Does it burn? Explain your observation.
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.
