temp sensor

I want to make a wireless temp sensor, can i transmit the data through RF using only one arduino

You can use a xbee( with an explorer)

The detailed tutorial is given on:

That's the prob, i am not using xbee module. check this, http://robokits.co.in/shop/index.php?main_page=product_info&cPath=7&products_id=75&zenid=6c6c437e39cc2d405cd50229c0284f15 . these are RF modules which i am gonna use.