Multiple choice

Which of the following is not correct regarding cathode ray tube?

  1. It is also called as Braun’s tube.

  2. Wehnelt cylinder is not used in cathode ray tube.

  3. It was invented by Karl Ferdinand Braun.

  4. It was invented in 1897.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

(1) The cathode ray tube was invented by the German Physicist Karl Ferdinand Braun in 1897 and is today used in computer monitors, TV sets etc. (2) The source of the electron beam is the electron gun which produces a stream of electrons through thermionic emission at heated cathode and focuses it into a thin beam by control grid. (The control grid is also called as Wehnelt cylinder.) So, 2nd option is incorrect.

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