Photoelectrons are ejected from a surface when light of wavelength.

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?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

How many neutrons does plutonium -196 with an atomic number of 78.