Q. An oxide coated filament is useful in vacuum tubes because essentially
A) It has high melting point
B) It can withstand high temperatures
C) It has good mechanical strength
D) It can emit electrons at relatively lower temperatures
Explanation
The correct answer is Option D: It can emit electrons at relatively lower temperatures.
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.