How does Bluetooth send data between nearby devices without a cable?
Show answer & explanation
Answer: It encodes data in radio signals that the devices exchange
It encodes data in ultrasonic sounds that the devices exchange — Bluetooth carries data with radio waves, not ultrasonic sound. Ultrasound is a mechanical vibration that needs a material medium; radio waves are electromagnetic. Neither should be described simply as requiring a straight, unobstructed path.
It encodes data in radio signals that the devices exchange ✓ — Bluetooth devices encode data in radio signals in the 2.4 GHz band and decode the signals they receive. During a connection they can change channels to reduce interference. Range depends on radio power, receiver design and obstacles, not one fixed distance.
It transfers data through magnetic induction between nearby coils — Bluetooth does not rely on magnetic induction between nearby coils to transfer data. It uses propagating radio waves, which have both electric and magnetic fields. The distinction is the transmission method, not the absence of a magnetic field.
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