Why does a hot metal object placed in a cooler room eventually cool down? Explain using the concepts of radiation and thermal equilibrium.
ٹھنڈے کمرے میں رکھی گرم دھاتی چیز آخرکار کیوں ٹھنڈی ہو جاتی ہے؟ اشعاع اور حرارتی توازن کے تصورات سے وضاحت کریں۔
Solution & explanation
It emits more radiation than it absorbs from the cooler surroundings, producing net energy loss; convection and conduction may also act. At thermal equilibrium there is no net transfer, although emission and absorption continue.
Independent study answer. Original textbook ↗ · English-medium printed page 31.