• So, hopefully that kind of clears up that question. And, of course, when the velocity actually is zero, this equation that the de Broglie has put forth is valid for anything that has momentum, so if something does not have any velocity at all, it actually does not have momentum, so you can't apply that equation anyway.

    能回答你的问题,当然,如果速度真的是零的话,德布罗意提出的这个方程,只对有动量的物体成立,所以如果一个东西没有速度,它没有动量,也就不能应用这个方程。

    麻省理工公开课 - 化学原理课程节选

  • This has made it very clear that there has to be -if you announce anything you have to announce it all at once on a certain date and you can't have favored people that you give the announcement to.

    很明显的一点...,如果要宣布事项,就要选定某一天,而且,你宣布的消息,不能只针对某一人群

    耶鲁公开课 - 金融市场课程节选

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