If you know that the work function of tungsten is(4.5ev) , find: a- Emitter constant (b) for tungsten. b- The value of the constant A at a femperature of (27270 °C ) if you know that the density of the current passing through is (J=15 A/m?).

If you know that the work function of tungsten is(4.5ev) , find: a- Emitter constant (b) for tungsten. b- The value of the constant A at a femperature of (27270 °C ) if you know that the density of the current passing through is (J=15 A/m?).

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter1: Atomic Structure

Section: Chapter Questions

Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?

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Question

If you know that the work function of tungsten
is(4.5ev) , find:
a- Emitter constant (b) for tungsten.
b- The value of the constant A at a temperature of
(27270 °C ) if you know that the density of the
current passing through is (J=15 A/m?).

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