Light of wavelength 550.0 nm is incident on a circular aperture of diameter D . The distance between the circular aperture and the screen is 3.0 m. The width of the central maximum is 5.75 mm. Determine the diameter of the circular aperture.

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)