你们有我们称为总横截面的,那是散射或者吸收的总概率,这些是我们要谈论的,2个现象。

You have what we call a total cross section which is the total probabilities of either scattering or absorption. These are the two phenomenon that we are talking about.

youdao

用20除以132000，但现在背散射，的概率是被散射回来的小球，除以总的小球数，你们记得。

But in our case, the probability of backscattering is going to be the number of balls that backscatter, and that's going to be divided by the total number of ping-pong balls.

youdao

用20除以132000，但现在背散射，的概率是被散射回来的小球，除以总的小球数，你们记得。

But in our case, the probability of backscattering is going to be the number of balls that backscatter, and that's going to be divided by the total number of ping-pong balls.

youdao