What is the charge 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)

C3h8o3 - glycerol major species present when dissolved in water

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.