The surface temperature of polaris is about 5973 k. at what wavelength is the peak radiation emitted from polaris?

polaris is not a luminous body. therefore, it does not emit radiation.
550 nm
485 nm
155 nm

The solution would be like this for this specific problem:

Given: 5973 K

λ_peak = 2.898 / 5973 K 

= 0.00048518 mm = 0.48518 μ = 4851.8 Ậ

Polaris emits peak radiation at 485 nm wavelength.

To add, Polaris, commonly the North Star or Pole Star, is the brightest star in the constellation of Ursa Minor. 

the answer for apex is the lowest