The Sun's spectrum peaks in the green region of the spectrum (i.e. ,green is the most intense color in its spectrum).The spectrum of Rigel (the knee of Orion)peaks in the short wavelength end of the visible spectrum.Compared with the Sun,Rigel is
A) cooler and redder.
B) hotter and redder.
C) cooler and whiter.
D) hotter and whiter.

Question

Quizplus · Accepted Answer

The fact that Rigel's spectrum peaks in the short wavelength end of the visible spectrum suggests that it is hotter than the Sun. Additionally, the knee of Orion appears blue-white in color, indicating that its spectrum has more intensity in the blue and white regions. Therefore, the best choice is D, hotter and whiter.

The Sun's Spectrum Peaks in the Green Region of the Spectrum