A cannon is fired horizontally at 243 m/s off of a 62 meter tall, shear vertical cliff. How many seconds will have elapsed before the cannon ball strikes the ground?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror'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

Which statement correctly describes the relationship between frequency and wavelength?