An experimental series stack of pem cells produces 2.20 x 108 w of power. if each cell contributes 231 kw, how many cells are in the stack? (round the answer to the nearest whole number.) cells

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)

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process