Acylindrical wire of radius 1 mm is made of copper metal. assume that each copper atom in metallic copper has one mobile electron free to move and carry current. if one amp of current is flowing through this wire, a. what is the average drift speed of the electrons? (units m/s). b. how long would it take for an electron to drift through 100 meters of such wire?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.