In a double-slit experiment, the slit separation d is 4 times the slit width w. How many bright interference fringes are in the central diffraction envelope? Number Units This answer has no units . (degrees) e Textbook and Media m kg S Hint m/s m/s^2 N Save for Later J Attempts: 0 of 10 used Submit Answer W N/m kg.m/s or N.s N/m^2 or Pa kg/m^3 g m/s^3 times