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’s temperature is the same as B’s.
Nothing. Temperature is related to brightness, not emitted wavelength.
A’s temperature is twice as high as B’s.
B’s temperature is twice as high as A’s.
Cooler stars (about 3000 K) emit most of their radiation at wavelengths shorter than 600 nm.