我们从一个低能级开始，到一个高能级去，这意味着需要吸收一个光子，我们要获得能量。

We start at this lower energy state and go up that means we need to absorb a photon, we have to take in energy.

youdao

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。

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

youdao

No, OK and that's correct, because each photon of light actually has more energy than is needed to eject an electron.

没有，好，对了，因为每一个光子实际上,都有更多的能量去逐出一个电子。

麻省理工公开课 - 化学原理课程节选

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

We start at this lower energy state and go up that means we need to absorb a photon, we have to take in energy.

我们从一个低能级开始，到一个高能级去,这意味着需要吸收一个光子，我们要获得能量。

麻省理工公开课 - 化学原理课程节选