Each joule is one newton of energy
meter of energy
newton-meter of energy
gram of energy

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

This is a mixture that has the same composition throughout.