During the expansion of the early universe, which two interactions were the last to separate? a. the strong and weak interactions b. the gravitational and strong interactions c. the electromagnetic and weak interactions or d. the electromagnetic and gravitational interactions

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?

When using the scientist method, which step comes last?

Two positive charges are equal. which has more electric potential energy?