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Physics Lesson 1: Vacuum, Gas Flow Conductance, Viscous Flow

18 Questions

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Physics Lesson 1: Vacuum, Gas Flow Conductance, Viscous Flow

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Questions and Answers

Who developed the 1st vacuum in 1904?

John Ambrose Fleming (correct)

Edison

Lee De Forest

Thomas Edison

What does a Fleming Diode do?

Allows electric current flow in both directions

Blocks all electric current

Generates heat

Allows electric current flow in one direction (correct)

What is the main function of a cathode in a vacuum tube?

Emits free electrons (correct)

Generates thermal energy

Blocks the flow of electrons

Collects free electrons

Why are vacuum tubes considered advantageous?

They can work at high temps without damage Signup and view all the answers

What is the primary disadvantage of vacuum tubes compared to semiconductor devices?

Size - they are huge compared to semiconductor devices Signup and view all the answers

In which year did Lee De Forest invent the vacuum tube?

1906 Signup and view all the answers

What is the simplest form of vacuum tube?

Vacuum diode Signup and view all the answers

Which vacuum tube has 3 electrodes, including a control grid?

Vacuum triode Signup and view all the answers

Who invented the tetrode vacuum tube in 1926?

Albert Wallace Hui Signup and view all the answers

What is the purpose of the screen grid in a vacuum tetrode?

To act as an electrostatic shield Signup and view all the answers

Which vacuum tube has a suppressor grid placed between the screen grid and plate?

Vacuum pentode Signup and view all the answers

What does the control grid do in a vacuum tube?

Controls the flow of electrons between cathode and anode Signup and view all the answers

What is the function of the suppressor grid in a gas-filled tube?

Acts as a negatively charged electrode Signup and view all the answers

What happens when an N-type material is fused with a P-type material?

Formation of a PN Junction Signup and view all the answers

What is the role of acceptor ions in the P-type material along the PN junction?

Attracting holes Signup and view all the answers

What creates a potential barrier zone around the PN junction?

Repulsion of holes by donor atoms Signup and view all the answers

How does a gas-filled tube operate?

By ionizing the gas with an applied voltage Signup and view all the answers

What is the purpose of the depletion layer in a semiconductor diode?

To create a potential barrier zone around the junction Signup and view all the answers