in a particular television picture the measured beam current is 60uA how many electrons strike the screen every second

1 ampere = 1 coulomb / sec = 1.6E19 electrons / sec

1 μamp = 1.0E-6 amperes

N = 60 μamp * 1.0E-6 amp / μamp * 1.6E19 electron / amp

N = 9.6E14 electrons

d. learned preferences i believe is your answer

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.