Bluetooth is a short-range wireless communication technology present in different consumer electronic devices. It allows different electronic devices to connect and exchange data with each other. In the bluetooth standard, called Class 2, the antennas transmit signals with power equal to $2.4 \mathrm{~mW}$ and allow two devices distanced up to 10 m to connect. Consider that these antennas behave as point sources that emit spherical electromagnetic waves and that signal intensity is calculated as power per unit area. Consider 3 as an approximate value for $\pi$. For the bluetooth signal to be detected by the antennas, the minimum value of its intensity, in $\frac{\mathrm{W}}{\mathrm{m}^{2}}$, is closest to (A) $2.0 \times 10^{-6}$. (B) $2.0 \times 10^{-5}$. (C) $2.4 \times 10^{-5}$. (D) $2.4 \times 10^{-3}$. (E) $2.4 \times 10^{-1}$.
Bluetooth is a short-range wireless communication technology present in different consumer electronic devices. It allows different electronic devices to connect and exchange data with each other. In the bluetooth standard, called Class 2, the antennas transmit signals with power equal to $2.4 \mathrm{~mW}$ and allow two devices distanced up to 10 m to connect. Consider that these antennas behave as point sources that emit spherical electromagnetic waves and that signal intensity is calculated as power per unit area. Consider 3 as an approximate value for $\pi$.\\
For the bluetooth signal to be detected by the antennas, the minimum value of its intensity, in $\frac{\mathrm{W}}{\mathrm{m}^{2}}$, is closest to\\
(A) $2.0 \times 10^{-6}$.\\
(B) $2.0 \times 10^{-5}$.\\
(C) $2.4 \times 10^{-5}$.\\
(D) $2.4 \times 10^{-3}$.\\
(E) $2.4 \times 10^{-1}$.