What is the relationship between the type of energy sublevels present and the principal energy level?

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?

From the perspective of an employee that effective channeling of work related information and concerns

What happens when you slowly pulled the carboard?