Mean free path

[mohdkhalid]

I was your ex student of 2018 batch. I drop this year and preparing for jee main with self
I was failed due to chemistry teacher, ....
I am not saying that here is only my chemistry teacher's fault .

But you are best, . I agree with 100% to you ...
You are best teacher of my life....
Sir pray for me . Because teacher's pray for student is same as parent's pray for child.