An object at 27°C has its temperature increased to 47°C.The power then radiated by this object increases by how many percent?
A) 3.3
B) 14
C) 29
D) 253

Question

Quizplus · Accepted Answer

The power radiated by an object is proportional to the fourth power of its absolute temperature (Stefan-Boltzmann Law). Converting the temperatures to Kelvin (300K and 320K), the power ratio is (320/300)^4 = 1.297, which is approximately a 29% increase.

An Object at 27°C Has Its Temperature Increased to 47°C