To determine whether your Wi-Fi frequency is 2.4 GHz or 5 GHz, you can check the settings of your router.
The steps to do this will vary depending on the make and model of your router, but in general, you will need to log in to the router's web-based control panel.
Once you have logged in, look for the wireless settings and check the frequency that your Wi-Fi network is operating on. Most routers will show the frequency as either 2.4 GHz or 5 GHz.
If you are unable to determine the frequency of your Wi-Fi signal using the router's control panel, you can try using a Wi-Fi analyzer app on your smartphone or computer to scan for available Wi-Fi networks and identify their frequencies.