Which of the following statements is a MAD goal? I am going to take one minute off of my 5K time in the next month. I am going to break the county record for the 100-meter freestyle. I am going to score five goals in the next soccer game. I am going to do well in my next three gymnastics meets.

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?