I have been struggling with this question for months. Can somebody help me.It is related to sound.

Yes that's one take - pretty obviously, I'd say from looking at it. Which is why it sounds the same all the way through. But if he'd done half of it in the morning, had a coffee, and come back to do the rest in the afternoon, then he'd sound different. We've covered this before several times, and there are several reasons for it. Eating, drinking anything other than water, changing your position in relationship to the mic - even your mood can make a difference. And because humans are very sensitive to the sounds of other humans, we notice these subtle changes, and because they're 'natural' there's no way you can process them out. Probably the worst thing to do is go from one day to the next - it really doesn't take much exposure to colds, damper air, stuff like that to make you sound very different indeed on a recording.

So when we record narratives, we do it in one sitting, or arrange that there's something else betweeen parts of it if we can't manage that. And that's sometimes noticeable, even though we've used the same mic, same soundbooth, same everything. I'm afraid that it's just one of those things we can do nothing about. And the closer to the mic you get, the more different it sounds...