JEE Main 20199 Jan, Evening shiftPhysicsMediumCommunication Systems79× since 2003
In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwith. The number of channels accomodated for transmitting TV signals of band width 6 MHz are (Take velocity of light c = 3 10⁸m/s, h = 6.6 10^34 J-s)