Object A emits most strongly at 400 nm, while object B emits most strongly at 800 nm. What can we say about their relative temperatures?
A) A's temperature is twice as high as B's.
B) B's temperature is twice as high as A's.
C) A's temperature is the same as B's.
D) Nothing. Temperature is related to brightness, not emitted wavelength.

Question

Quizplus · Accepted Answer

According to Wien's Law, the peak wavelength of emission is inversely proportional to the temperature. Therefore, if object A emits most strongly at 400 nm and object B at 800 nm, object A is at a higher temperature, specifically twice as high as object B's temperature.

Object a Emits Most Strongly at 400 Nm, While Object