WiFi uses electromagnetic waves in the microwave band, around 2.4 GHz or 5 GHz.
By Internet waves, one would assume you mean WiFi. When talking about WiFi, it does not use electromagnetic waves but instead uses radio waves like your TV or radio does.
Electrical energy.
You use sound waves to communicate.
WiFi routers use radio waves as electromagnetic waves to transmit data over a wireless network. These radio waves typically operate in the 2.4 GHz or 5 GHz frequency band, allowing devices to connect to the internet wirelessly within a certain range of the router.
Radio waves.
yes it does and yes you can use your wifi at your home
Sound.
Yes
Yes it can use wifi and there is even a way for it to be a wifi hot spot.
Wifi password recovery is an app that you can use in recovering your wifi password.
X-rays
microwaves