5 points
2. If a circuit has four 20 ohm resistors wired in series, what is the
equivalent (total) resistance?
a. 60 ohms
b. 80 ohms
c. 5 ohms
d. 100 ohms

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?