Physics · Modern Physics

Which of the following options about the cathode in a cathode ray tube (CRT) is INCORRECT?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1It is used to obtain high emission of electrons at a moderate temperature.
2It is cylindrical in shape.
3It has a layer of barium and strontium oxide deposited on its end.
4The amount of electrons generated by the cathode depends only on its heating temperature, not on its surface area.✓

Correct answer

The amount of electrons generated by the cathode depends only on its heating temperature, not on its surface area.

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