Electrons are fired at a rectangular potential energy barrier, once every 293 ms.293 ms. If the barrier is 2.55 nm2.55 nm thick and has a height that exceeds the energy of the incident electrons by exactly 662 meV,662 meV, how long on average would you expect to wait for one electron to pass through the barrier?

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

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?

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.