Physics XI Notes for Physics Notes

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Transfer of heat- Old is Gold

  1. Although aluminum is good conductor of heat, how can an aluminum foil with shiny surface be used to keep food hot for longer time?
  2. Hot water pipes used in the room are painted black. Why?
  3. What is a black body? How is it realized in practice?
  4. Why are good absorbers always good emitters?
  5. Why are two thin blankets warmer than a single blanker of double the thickness?
  6. During the winter, the animals curl into a ball. Explain why?

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