Q. Coating of strontium oxide on tungsten cathode in a valve is good for thermionic emission because
A) Work function decreases
B) Work function increases
C) Conductivity of cathode increases
D) Cathode can be heated to high temperature
Explanation
The correct answer is Option A: Work function decreases.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.