एक भूस्थिर संचार उपग्रह लगभग __________ किमी की ऊँचाई पर स्थित एक टेलीविज़न टॉवर की तरह कार्य करता है।

Consider the following statements regarding amplitude modulation and choose the correct option: Statement A: Amplitude modulated waves can be produced by application of the message signal and the carrier wave to a non-linear device, followed by a band pass filter. Statement B: For a sinusoidal message signal, an amplitude modulated wave contains frequencies ωm, 2ωm and ωc, each of the same amplitude.

In the context of optical wireless communication, which characteristic of Li-Fi technology distinguishes it from traditional Wi-Fi?