Question { Videocon, 140007 }

Which type of modulation is used in TV transmission?

Answer

vsb
instead of using ssb or dsb we take lsb & some part of msb
hence it is called vsb.

Question { Infosys, 7832 }

WHAT IS ELECTRONICS?

Answer

Electronics engineering,[1] also referred to as electronic engineering,[2][3] is an engineering discipline where non-linear and active electrical components such as electron tubes, and semiconductor devices, especially transistors, diodes and integrated circuits, are utilized to design electronic circuits, devices and systems, typically also including passive electrical components and based on printed circuit boards. The term denotes a broad engineering field that covers important subfields such as analog electronics, digital electronics, consumer electronics, embedded systems and power electronics. Electronics engineering deals with implementation of applications, principles and algorithms developed within many related fields, for example solid-state physics, radio engineering, telecommunications, control systems, signal processing, systems engineering, computer engineering, instrumentation engineering, electric power control, robotics, and many others.[4][verification needed]

Question { 4038 }

why cant we transmit the low frequency signal for long
distances??

Answer

according to farmula e=mc^2, and c=fXlemda hence frequency is directly propertional to energy or power. low the frequengy lower the power hence singal will not travel to long distance