I don't know how many of them observed this........but I think very few......Whenever we switch on the t.v sound is heard immediately but video comes only after some time......Do you know Why?
ans: When T.V is switched on,electric power is supplied to both audio and video sections.Video sections consists of cathode ray tube (CRT) popularly known as picture tube.An electron beam is used to sweep the screen to display the pictures.This electron beam is generated within the CRT using a filament Which can emit the electrons only when heated.This heating process requires some time.Audio section do not require any such warm up to start functioning and so we hear the sound as soon as we switch on.
ans: When T.V is switched on,electric power is supplied to both audio and video sections.Video sections consists of cathode ray tube (CRT) popularly known as picture tube.An electron beam is used to sweep the screen to display the pictures.This electron beam is generated within the CRT using a filament Which can emit the electrons only when heated.This heating process requires some time.Audio section do not require any such warm up to start functioning and so we hear the sound as soon as we switch on.
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