Which of the following is an example of kinetic energy?
a sled sitting at the top of a hill
a girl running in a race
a tank containing gasoline
a car sitting motionless save

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Which two particles are found in the center of an atom

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?