How would you calculate the speed of sound in a medium if you knew how far away an object was and how long it took a sound pulse to reach it through that medium?

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 of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s