Sodium is a highly reactive metal and chlorodyne is a poisonous gas which compound do they for a chemically combines

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

Could someone . i have tried to solve myself but my calculation is off

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car