Adsense Payrate

Adsense Pay Rate

Google does not disclose exactly how much you'll earn per ad clicked. The payment you receive depends on how much advertisers are paying Google for the particular keyword ad. You will earn a share of that amount. I've heard of people earning anywhere from 2 cents to $15 per click.

So it is logical to believe that the more popular keywords (debt free, money, mp3, etc.) may earn you more since these are highly competitive keywords that are searched for quite a bit on the web. As a result, advertisers generally pay more for these keywords.
In other words, it would be to your advantage to create a site that focuses around the more popular keywords to increase your chances of earning more for the ads you display.
To get an idea of the keywords people are paying the most money for check out high paying keywords list .

Even though Google will not reveal how much you are earning for each ad that is clicked from your site, you can still login to your account at any time and see the total amount of revenue you've generated that day, week, month, year, etc.
How much you'll earn also depends largely on the amount of targeted traffic you receive to your own site, how well the ads match your audience's interests and of course, the amount you receive per click.

Google pays Web site owners with a monthly check that is sent directly to your specified address.

Keep in mind, the better the ads match your content, the more clicks you'll receive.