I have applied for an Adsense account, and I am hoping that my account would be approved.

I understand that once approved, I will be provided with some codes which needs to be placed on my websites or blogs.

Currently, I own one website on which I will be placing the adsense ads once approved. I intend to purchase one more website and was wondering if I have to apply for adsense each time I purchase a new website or the same code has to be copied on any new websites/blogs.

Any help on this would be appreciated?

Yes, you're free to copy adsense code to many sites. Even more - Google provides such instruments as URL channels to track clicks. You may compare your sites, do some analysis and make changes to raise your earnings.

man i have adsense on so many sites and on free blogs, us.to sites,
Don't worry. Just don't click on your ads.

yeah, you can use your adsense ads on as many sites as you want