Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

43. 

Work function of oxide coated cathode is much lower than that of tungsten cathode.

[A]. True
[B]. False

Answer: Option A

Explanation:

Therefore emission current from oxide coated cathode is more.


Swathy said: (Feb 15, 2019)  
Please explain the answer.

Swathy said: (Feb 15, 2019)  
Can't understand the concept. Please explain clearly.

Fatima Noor said: (Jan 29, 2020)  
Oxide coated cathode emit electrons while tungsten cathode provides heat for this purpose. So the word function is more in the case of second one because heat provides more energy to emit the electrons.

Vikas said: (Aug 13, 2020)  
Thanks @Fatima.

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