A scientist working in a lab generates an unknown gas and, in order to find out its composition, excites the gas so that it generates light that illuminates a diffraction grating having 500 lines per millimeter. The two second order bright fringes on a screen 1.5 meters away and are 2.2 m apart. Determine the wavelength and frequency of the light?? (c = 3.00x10^8 m/s)