Which two trials could be used to measure the surface area

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?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Heat is the total potential energy of a substance that can be transferred. true false