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Why is the bottom of a tea kettel blacke...

Why is the bottom of a tea kettel blackended while its upper part is so polished?

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Black surface is a good absorber of heat while polished surface is a bad radiator the kettle is blank at the bottom so that it may be absolved heat quickly .The upper part of the Kettle is polished so that its radius little heat to the outside.
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BINA LIBRARY-THERMAL PROPERTIES OF MATTER -EXERCISE
  1. Why does food get cooked more quickly in a pressure cooker?

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  2. Why white cloths are preferred in summer ?

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  3. Why is the bottom of a tea kettel blackended while its upper part is s...

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  4. Explain why a piece of iron appears to be cooler than a piece of wood ...

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  5. Explain why two layer of cloths of equal thickness provide warmer cove...

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  6. Cloudy nights are warmer than clear nights-why?

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  7. At what common temperature would a block of wood and a block of metal ...

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  8. Explain why a piece of paper warpped tightly on a wooden rod is found ...

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  9. Two thermometers are constructed in the same way except that one has a...

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  10. A metallic solid sphere and a hollow sphere of same material and exter...

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  11. A sphere ,a cubeand a thin circular plate,all made of the same meterie...

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  12. Heat is generated continuosly in an electric heater ,but its temperatu...

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  13. A zinc rod is measured by means of a brass scale (Which is correct at...

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  14. A hot ball of iron weighing 200 g is dropped into 500 g water at 10°C ...

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  15. The densities of two substance are 2:3 and their specific heats are 0....

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  16. Calculate the minimum amount of water at 15°C needed to cool 200g of ...

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  17. A piece of metal weighing 50 g is heated to a temperature of 1000°C a...

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  18. How much steam at 100°C will just melt 3200g of ice at -10°C ?

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  19. Find the result of mixing 100 g of ice at -12°C with 50g of water at 9...

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  20. Calculate the amount nof heat required to change 5.0 kg of a ice to -2...

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