Consider the following: 1. Bluetooth device 2. Cordless phone 3. Microwave oven 4. Wi-Fi device Which of the above can operate between 2.4 and 2.5 GHz range of radio frequency band?
- A1 and 2 only
- B3 and 4 only
- C1, 2 and 4 only
- D1, 2, 3 and 4Correct
Explanation
The correct answer is D because all four devices operate within the 2.4 GHz Industrial, Scientific, and Medical (ISM) radio band.
- Bluetooth devices use the 2.4 GHz frequency for short range communication between electronics.
- Many cordless phones operate on the 2.4 GHz band to provide wireless connectivity within a home.
- Microwave ovens use 2.45 GHz frequencies to heat food by agitating water molecules.
- Wi-Fi devices commonly use the 2.4 GHz band for wireless internet networking.
Since the 2.4 GHz band is an unlicensed frequency range, it is shared by a variety of consumer technologies and household appliances, which can sometimes lead to signal interference between them.
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