A diffraction grating has a slit density of 980. lines/cm. These are illuminated by green light (525 nm). A screen is located 0.950 m from the diffraction grating. At what diffraction angle (in degrees) will you see the 2nd dark fringe

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.