Yes. In fact, there is not enough energy in a single photon to go ahead and eject an electron from this zinc surface.

是的，事实上，这里的光子没有足够的能量,去从锌表面逐出一个电子。

麻省理工公开课 - 化学原理课程节选

And, when zinc sulfide is hit by particles or by anything, by radiation or by particles of greater than a certain critical energy, there is a glow.

当粒子或其他东西,通过辐射或粒子的方式，并且能量高于临界值,撞击到硫化锌的表面上的时候，就会发光。

麻省理工公开课 - 固态化学导论课程节选

All right. So please raise your hand now if you think there'll be sufficient energy to eject electrons from the metal surface?

好的，如果你们认为,有足够的能量从金属表面,射出电子请举手？

麻省理工公开课 - 化学原理课程节选