What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.20x10^15Hz?

What type of matter is made of only one kind of atom

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.

Which is true according to the law of conservation of energy