Wireless internet is a way to send and receive internet data over relatively short distances with low-power transmitters. what type of waves are transmitted for wifi? a) light b) radio c) seismic d) sound

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?