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प्रश्न
Nishigandha kept a vessel containing all the ingredients for making tea in a solar cooker. Shivani kept a similar vessel on a stove. Whose tea will be ready first and why?
उत्तर
Shivani's tea will be prepared first.
In Shivani's case, the intensity of the flame in contact with the vessel is very high due to which the flow of heat will be faster. Thus, the time taken by the tea to reach its boiling point will be less. Hence, tea will be prepared fast.
In the case of Nishigandha, the intensity of radiation reaching the vessel is not as high as compared to stove's flame. Thus, the flow of heat will be slower in this case due to which more time will be taken to reach the boiling temperature of the tea. Hence, tea will be prepared at a slower rate.
संबंधित प्रश्न
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| Group A | Group B | ||
| a. | Temperature of a healthy human body | i. | 296 K |
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| c. | Room temperature | iii. | 0°C |
| d. | Freezing point of water | iv. | 212∘F |
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Analogy
Total Kinetic Energy of molecules: Heat :: Average Kinetic Energy : ______.
Make a list of electrical equipments at home which we get heat from.
When ______ flows through a conductor, heat energy is produced.
Match the following:
| 1. | Source of heat | a. | heat energy |
| 2. | Electric current | b. | calorie |
| 3. | Gasoline | c. | 37°C |
| 4. | Unit of heat | d. | Electric kettle |
| 5. | Human body temperature | e. | sun |
List and describe the sources of heat.
