We always see the same side of the moon because choose one: a. the moon does not rotate on its axis. b. the moon rotates once each revolution. c. when the other side of the moon is facing toward us, it is unlit. d. when the other side of the moon is facing earth, it is on the opposite side of earth. e. none of the answer options are correct.

Will you chech and finish these for me, because i am stumped with them.

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 considered noble gases? a. bromine b. neon c. argon d. chlorine