Dr. eriksson is working on a material called selenium. she is adding a certain number and type of atoms to the selenium, which will control its conductivity.
selenium is most likely what kind of material?
semiconductor

conductor

superconductor

insulator

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

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?

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers distance