If the index of refraction of a certain material is n=2 the speed of light in this material is ?

Ineed the answer to question 1 , i’m desperate

How does the entropy of steam compare to the entropy of ice?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton