How, in terms of particles, do these 2 types of mixtures differ?

Which feature of a heating curve indicates a change ofn state

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?

To a of 4 x hz is 1. 0. mm nm nm