Question

Properties of a thermal radiator include

Group of answer choices

Hotter objects look bluer

Hotter objects look redder

Hotter objects emit less light for a given area.

Hotter objects emit more light for a given area.

The power radiated is proportional to the temperature raised to the fourth power.

The power radiated is inversely proportional to the temperature.

Answer 1

* Hotter objects look bluer --> At room temperature, each objects radiate at infrared region. When heated objects becomes red, on further heating it becomes yellow to white to blue to violet, towards ultraviolet region.

* Hotter objects emit more light for a given area ---> Intensity of radiation is proportional to the temperature raised to the fourth power.

* The power radiated is proportional to the temperature raised to the fourth power. --> According to Stefan-Boltzmann Law, Power radiated per unit area, P= a* * T⁴ .where is Stefan-Boltzmann constant, a is a coefficient which is less than or equal to 1; in the case of a black body a = 1

answered by: anonymous