CBSE Class 12-science Answered

Diagram showing the (i) ground wave (ii) sky wave and (iii) space wave propagation modes for em waves:

Frequency range:

(i) Standard AM broadcast: 540-1600 kHz

(ii) Television: 54-72 MHz: VHF (very high frequencies)

                    76-88 MHz: VHF (very high frequencies)

                    174-216 MHz: UHF (ultra high frequencies)

                    420-890 MHz : UHF (ultra high frequencies)

(iii) Satellite communication: 5.925-6.425 GHz (up link)

                                       3.7 - 4.2 GHz (down link)