why humans are not able to see thee cathode rays in cathode ray tv as compared to an camera

Asked by souravkoshti | 16th Nov, 2014, 05:08: PM

Expert Answer:

Cathode rays are stream of electrons emitted from the cathode of a discharge tube,to which a potential difference of 10,000 V is applied and at a pressure of about 0.01 mm of Hg. Under such a condition the positive ions attain large kinetic energy and they eject electrons from the cathode. These electrons constitute cathode rays. These happen within the interior parts where all the necessary condition for the production of cathode rays are satisfied.A cathode ray tube actually converts the electrical signal into a visual signal by applying the electrical signal on the deflecting plate.Hence in a telvision we obtain the visual pattern of the electrical signal.

Answered by Jyothi Nair | 17th Nov, 2014, 09:29: AM