Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion


Assertion (A): Alkali metals are used as emitters in phototubes.

Reason (R): Alkali metals have low work functions.

[A]. Both A and R are true and R is correct explanation of A
[B]. Both A and R are true but R is not a correct explanation of A
[C]. A is true but R is false
[D]. A is false but R is true

Answer: Option A


No answer description available for this question.

Priya said: (Aug 7, 2016)  
Please explain it.

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