Which statement is true about radiation energy transfer mechanism?

• A. Emission and Absorption
• B. Conduction
• C. Convection
• D. Phase Change

Answer: (A)

Radiation transfers energy through electromagnetic waves. A hotter object emits infrared radiation, and another object can absorb some of that radiation, gaining energy. This process doesn’t require a medium, so radiation can occur through vacuum, which is why the Sun can warm the Earth. Emission and absorption describe this mechanism directly, making them the true statement about how radiation transfers energy.

Conduction involves energy transfer by direct contact and molecular interactions within a substance, convection relies on moving fluids carrying heat, and phase change deals with latent heat during transitions like melting or boiling, not the core way radiation operates.