802.11g

this is the standard mode for wi-fi connection so the frequency should be about 2.4mhz!!

Both b and g use 2.4 GHz and thats why they say don't use 2.4Ghz cordless phones if you have a wireless network at home. Many things from a cordless phone to a RC airplanes are at 2.4GHz. So for a consistent network you might want to use 802.11a, cos thats at 5Ghz and bypasses all the other frequencies. All said the popular standards are now getting replaced by 802.11n, which is really fast and can give you a bigger range. No worry about interference.

This is free channel who's frequency is 2.4Mhz used by Wi-Fi or Wireless LAN. 802.11g is Standardization set by IEEE you can search similar thread 802.11a and 802.11b. This is available from the internet for FREE try to gather more information about this.