8) An electromagnetic wave A has a frequency 5 times higher than that of electromagnetic wave B. How do their wavelengths compare]? 9) How does the frequency of electromagnetic wave A compare to the frequency of that of electromagnetic wave B if the ratio of their wavelengths is 1:3 10) The spectrum of a blackbody has a peak wavelength of 7.7 x107 m. What is its temperature in kelvins? 11) The blackbody spectrum of a star with a surface temperature of 8000 K will peak at what wavelength in meters? 12) Star A (Temperature Ta) is two time hotter than star B(Temperature Tg). Compare the peak wavelengths Aamax and ABmax 13) Two stars A& B have the same luminosity (La = Lg) but ( Ta= 2Tg). What is the ratio of the subsurface areas of the stars? (Use Stefan-Boltzmann law L= cAT%) 6 = 5.7x10 watts.m2.K* A: Subsurface area of the blackbody