What do you mean by surface barrier?

Important Questions on Electron Emission

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 8

What are the materials used for the thermionic emitters?

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 9

What are the advantages of indirectly heated cathode over the directly heated cathode?

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 10

State two principal electrodes that are present in every vacuum tube.

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 11

Specify the most common use of a diode valve?

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 12

What is the maximum efficiency of an (i) half-wave rectifier and (ii) full-wave rectifier?

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 13

In a diode, plate is at $-10 \mathrm{Volt}$ and cathode is at $-180 \mathrm{Volt}$. Will it will conduct? Explain.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 14

Name different electrodes in a triode.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 18 - Electron Emission>MODEL QUESTIONS>Q 15

What is the function of grid in a triode?