If slickwater is used for fracking, but the proppant is mistakenly left out of the slick water, how would this effect the fracking process?

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)

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

Using data from seismic waves, geologists have learned that earth’s interior is made up of several