Light of intensity 2.00 w/m2 passes through the pupil of one of your eyes and eventually falls on your retina. the radius of the pupil is controlled by the iris. in a human eye, the radius of the pupil can vary from about 1.0 mm to about 3.5 mm. the area of the opening can be calculated from pi (3.1416) times the radius squared. if your pupil is open to a radius of 3.5 mm, how much light energy passes through in one minute? give your answer in millijoules.

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.