Which one of the following descriptions explains why the graphs showing the intensities and wavelengths are different?
a. blue stars are cooler than yellow stars; therefore, the blue star peaks at the shorter-wavelength portion of the spectrum and the yellow star at the longer-wavelength portion of the spectrum.
b. blue stars are warmer than yellow stars; therefore, the blue star peaks at a longer-wavelength portion of the spectrum and the yellow star peaks at the shorter-wavelength portion of the spectrum.
c. yellow stars are cooler than blue stars; therefore, the yellow star peaks at the longer-wavelength portion of the spectrum and the blue star peaks at the shorter-wavelength portion of the spectrum.
d. yellow stars are cooler than blue stars; therefore, the yellow star peaks at the shorter-wavelength portion of the spectrum and the blue star peaks at the longer-wavelength portion of the spectrum.