What conditions are needed for a sound wave to form?
A vibration must occur.
The sound must be able to travel a certain distance.
Someone must be able to hear the sound.
There must be a medium for the sound wave to travel
through.

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?

The least penetrating form of radiation is

Ways that industry and agriculture use physical properties to separate substances