24- What happens to a given mass of water as it is cooled from 4°C to zero? (a) expands
(b) contracts
(c) vaporizes
(d) Neither expands, contracts, nor vaporizes.

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

What is the final velocity of the initial velocity of 25 and -50?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.