Nakul balanced four black balls of the same material and three grey balls of a different material on a weighing scale as shown below.

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)

Modern weaponry has increased the number of deaths in wars and violent conflicts.

What natural processes produce large quantities of co2