So our last question we ask is what's the total number of photons emitted if we give this given intensity for 60 seconds?

最好的问题是如果我们,按照给定的强度照射60秒,那么总的光子数是多少？

麻省理工公开课 - 化学原理课程节选

The one thing you want to keep in mind though is that Hertz does not actually mean inverse seconds, it means cycles per second. So, if you're talking about a car going so many meters per second, you can't say it's going meter Hertz, you have to say meters per second.

写成5每秒，或5赫兹,你们要记住的是赫兹,并不等于秒的倒数，它是每秒的循环数，如果你们说,一辆车一秒可以走多少米,你不能说它走了米赫兹。

麻省理工公开课 - 化学原理课程节选

I can change the number of seconds that it does it.

我能改变它显示的秒数。

哈佛公开课 - 计算机科学课程节选

Frequencies, how many times you go around, f is revolutions per second It's called the angle of velocity.

频率就是一秒转多少圈,因为 f 是每秒转过的圈数,这就是角速度

耶鲁公开课 - 基础物理课程节选