The length of some fish are modeled by a von bertalanffy growth function. for pacific halibut, this function has the form l(t) = 200(1 – 0.956e–0.18t ) where l(t) is the length (in centimeters) of a fish t years old.
(a) find the rate of change of the length as a function of time

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?