The total energy emitted per unit time at all wavelengths from an object increases by what factor if its temperature is increased by a factor of 3 (e.g. ,from room temperature to 900 K)?
A) 27
B) 81
C) 3
D) 9

Question

Quizplus · Accepted Answer

The total energy emitted per unit time is proportional to the fourth power of the temperature (Stefan-Boltzmann law). If the temperature is increased by a factor of 3, then the total energy emitted per unit time increases by a factor of (3)^4 = 81. Therefore, the correct choice is B.

The Total Energy Emitted Per Unit Time at All Wavelengths