The UC Davis physicist measures the thickness of a layer of a benzene with nb = 1.50 by shining monochromatic light onto the film and varying the wavelength of the light (the film is in the air with n = 1). She finds that the light of wavelength 635 nm is reflected most strongly from the film. a) What is the minimum thickness of the film? b) What would be the wavelength of the most reflected visible light if the same layer was placed on the surface of water with nw = 1.3 while the laser still shines from the air.

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.