PHYS 331 Midterm: Exam
Document Summary
Put your name and student id on all pages right now. You must show all work and use correct signi cant gures for full credit. The observation is still performed in the fourth-order peak. Page 2 of 4: (20 pts) an unknown gas is contained in a glass cell of length 3. 0 0. 1 cm. The cell is inserted into one arm of a michelson interferometer illuminated by light of wavelength 650. 0 0. 1 nm. As the gas is pumped out of the cell, 1. 5 0. 5 fringes cross a point on the observing screen. It is observed that the m = 4 peak in the multi-slit interference pattern has zero amplitude, while all peaks with m < 4 are visible. Page 4 of 4: (20 pts) two wavelengths of light near 640 nm and separated by 10. 0 ghz are sent into a fabry-perot interferometer whose mirrors are separated by 3. 0 mm and have 95% re ectance.
