Awater wave travels 36 meters in 15 seconds. what is the speed of the wave?
540 m/s
2.4 m/s
0.42 m/s
1.9 m/s

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

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot