Which of the statements below best describes the relationship between a star's mass and its duration on the main sequence? A) The lower the mass, the shorter the main sequence lifetime.
B) Main sequence lifetime doesn't depend on mass, but rather the volume of the star i. e. Red Giants vs. White Dwarfs
C) The higher the mass, the shorter the main sequence lifetime

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?