Bioenvironmental Engineering (BEE) Block 5 Practice Test

For radiation heat loss occurs when?

The surrounding objects have a higher surface temperature than the body. The surrounding objects have the same surface temperature as the body. Heat loss occurs when the surrounding objects have a higher temperature than the body. The surrounding objects have a lower surface temperature than the body.

Correct Answer:

The surrounding objects have a lower surface temperature than the body.

Explanation:

Radiation heat loss happens because heat is emitted as infrared waves by a warm body to its surroundings. This transfer doesn't require touching or air between them. The direction of that heat flow depends on the temperature difference: if the surroundings are cooler than the body, the body radiates heat away to those cooler surfaces, leading to a net loss of heat. If the surroundings are warmer, the body would gain heat by radiation; if they’re at the same temperature, there’s effectively no net radiative exchange. So, heat is lost by radiation when the surrounding objects have a lower temperature than the body.

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