Final answer:
Wireless networks commonly use 2.4 GHz and 5.8 GHz channels because they are unlicensed and available for public use, and they are less likely to be absorbed by building materials.
Step-by-step explanation:
The wireless networks in homes use 2.4 GHz and 5.8 GHz channels because they are unlicensed frequencies available for public use. These frequencies belong to the radio-wave portion of the electromagnetic spectrum and are chosen for applications like Wi-Fi and highway toll sensors which operate in similar ranges. The choice of these frequencies is also practical because they are less likely to be absorbed by common building materials, making them effective for wireless communication within homes and other structures.