Radio frequency spectrum is used for a wide range of purposes In this context consider the fol...........

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Radio frequency spectrum is used for a wide range of purposes. In this context, consider the following devices

1. Terrestrial broadcast television

2. Satellite broadcasting television

3. Bluetooth

4. WiFi

5. Remote car keys

Which among the above mentioned devices use Radio spectrum?

1, 3, 4 and 5 Only

1, 3 and 4 Only

2, 3, 4 and 5 Only

1, 2, 3, 4 and 5

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Explanation:

Each of the examples given in the above question uses Radio waves for its functioning.
Radio frequency spectrum is used for a wide range of purposes, for things like keeping people safe (military and police), in touch (mobile phones), on course (GPS navigation) entertained (radio and television broadcasting) and online (mobile broadband and Wi-Fi).
Some other uses that are closely tied to everyday life include: Terrestrial broadcast television and radio, Satellite broadcasting, Location systems like GPS, Wi-Fi and Bluetooth, Remote car keys, Cordless phones etc.