can't use this 不能使用此
And if your answer is no, your answer will be no, then you just know you can't use this equation here.
如果不是,那就不能,你就知道,你不能用这个方程了。
Adiabatic expansion means you can't use this.
这与等容的。
And the reason is, and this will come up on the problems and a lot of students end up using this equation, which is why I want to head it off and mention it ahead of time, we can't use an equation because this equation is very specific for light.
原因是,很多同学在解题时,都会用这个方程,所以我要,事先提醒你们一下,我们不能用这个方程,因为它只对光是用。
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