Final answer:
The region of the electromagnetic spectrum that includes photons with a frequency of 2 x 10ˆ10 Hz is the microwave region.
Step-by-step explanation:
The region of the electromagnetic spectrum that includes photons with a frequency of 2 x 10ˆ10 Hz is the microwave region. The microwave region of the spectrum has frequencies ranging from 108 to 1011 Hz. It is used in various applications such as communication, cooking, and radar technology.