ENEM 2023 - QUESTION 93 - NATURAL SCIENCES - PHYSICS
Question 93 from the yellow booklet of the 2023 ENEM Natural Sciences exam - Physics - Wave Motion
Bluetooth is a short-range wireless communication technology present in various consumer electronic devices. It allows different electronic devices to connect and exchange data with each other. In the Bluetooth standard, known as Class 2, the antennas transmit signals with a power of 2.4 mW and allow two devices up to 10 m apart to connect. Consider that these antennas behave as point sources that emit spherical electromagnetic waves and that the signal intensity is calculated by the power per unit area. Consider 3 as an approximate value for Ω.
For the Bluetooth signal to be detected by the antennas, the minimum value of its intensity, in mW, is closest to...