How does radiation differ from conduction and convection in terms of heat transfer? Give everyday examples and explain how different surfaces affect radiation absorption and emission.
حرارت کی منتقلی میں اشعاع، ایصال اور حمل سے کیسے مختلف ہے؟ روزمرہ مثالیں دیں اور مختلف سطحوں کا اشعاع کے انجذاب و اخراج پر اثر بیان کریں۔
Solution & explanation
Conduction transfers energy through microscopic interactions, as along a metal spoon. Convection carries energy with fluid movement, as in a heated room. Radiation uses electromagnetic waves, as warmth from sunlight, and needs no medium. Dull black surfaces are generally good infrared absorbers and emitters; polished surfaces are good reflectors.
Independent study answer. Original textbook ↗ · English-medium printed page 31.