Why are high frequency carrier waves used for transmission of audio signals?

For high frequency, a capacitor offers

Define frequency of the wave ?

Why does a metal wire used for electrical transmission sag?

Choose the correct option? The frequency of transmission of a radio station is 30MHz, the wavelength of the waves transmitted by the centre will be A. 5 meter B. 10 meter C. 15 meter D. 20 meter

Red colour is used in danger signal

Consider an optical communication system operating at lambda=800 nm . Suppose, only 1% of the optical source frequency is the available channel bandwidth for optical communication. How many channels can be accommondated for transmitting audio signals requiring a bandwidth of 8kHz

Assertion : Electromagnetic waves with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency .

What care has to be taken for high tension power transmission line?