Electrons are fired at a rectangular potential energy barrier, once every 221 ms. If the barrier is 2.55 mm thick and has a height that exceeds the energy of the incident electrons by exactly 637 meV, how long on average would you expect to wait for one electron to pass through the barrier

An uplifted block of rock between two normal faults

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

What are igneous intrusions and extrusions