Ozone absorbs light having wavelengths of 2200 to 2900 angstroms protecting us from UV radiation. What are the frequencies and energy of the most energetic of these photons? This is my workings: E = h*v lambda*v = c 2200 A *(10^-10 m / 1 A) = 2.2E-7 m 2900 A *(10^-10 m / 1 A) = 2.9E-7 m v = (3.0 * 10^8 m/s)/lambda v = (3.0 * 10^8 m/s)/2.2E-7 m = 1.4E15 s^-1 v = (3.0 * 10^8 m/s)/2.9E-7 m = 1.0E15 s^-1 E = (6.626*10^-34 J*s)*1.4E15 s^-1 = 9.0E-19 J Most energetic? E = (6.626*10^-34 J*s)*1.0E15 s^-1 = 6.9E-19 J Is this what is being asked? Thanks.