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WiFi uses how much frequency?

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WiFi uses how much frequency?

(a) 2.2GHz

(b) 3GHz

(c) 3.5GHz

(d) 2.4GHz

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I would like to ask this question from Communication with IOT Devices with Thoughts topic in chapter Communicating with IoT Devices : Exploring Future User Interface of IOT

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The correct choice is (d) 2.4GHz

Explanation: WiFi is a local wireless technology that uses 2.4GHz ultra high frequency or 5 GHz super high frequency radio waves.

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