Search on Davisson-Germer Experiment that confirms De Broglie’s hypothesis. Make a synthesis of their experiment.​

What’s the scientific notation for the number 6,840,000,000

Can someone me with questions 12 and 13 plz.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?