Ella holds an ice cream cone in her hand. She soon notices that her hand begins to feel cold. What is different about the particles that make up her hand? A They are gaining energy B They are joining together C They are getting larger D They are moving slower

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?