Question

An object having a fixed emissivity of 0. 725 radiates heat at a rate of 10 w when it is at an absolute temperature t. If its temperature is doubled to 2t, at what rate will it now radiate?.

Answer 1

160 W

If the temperature is doubled to 2t, the rate at which it will now radiate is 160 W.

What is meant by emissivity?

• The ability of a substance to reflect heat radiation from its surface is measured by its emissivity.
• Thermal radiation is a type of electromagnetic radiation that includes infrared radiation, which the human eye cannot perceive, as well as visible radiation (light).
• According to the Stefan-Boltzmann law, emissivity is the quantitative comparison between the thermal radiation of a surface and that of an ideal black surface at a given temperature.
• Between 0 and 1 is the ratio's range.

What is energy radiation?

• The emissivity of a substance is a measurement of how well it reflects heat radiation from its surface.
• Two elements that affect power dissipation in the form of radiation are the material's surface emissivity and the temperature difference between the chip surface and the surrounding air.

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