While a kettle boils, 0.018kg of water changes to steam
calculate the amount of energy required for this change
specific latent heat of vaporisation of water = 2.3 x 1j/kg

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

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Which transition by an electron will release the greatest amount of energy? oa ob oc od