Podcast
Questions and Answers
What is the phenomenon of ejection of electrons from a metal surface by the application of heat called?
What is the phenomenon of ejection of electrons from a metal surface by the application of heat called?
- Electron emission
- Thermal expansion
- Electromagnetic induction
- Thermionic emission (correct)
Who discovered the phenomenon of thermionic emission?
Who discovered the phenomenon of thermionic emission?
- Richardson
- Edison (correct)
- Faraday
- Dushman
What is the unit of the emission constant A in the Richardson-Dushman equation?
What is the unit of the emission constant A in the Richardson-Dushman equation?
- joule per kelvin
- ampere per kelvin
- ampere per square meter-kelvin squared (correct)
- volt per square meter
What is the term for the current flowing due to thermionic emission?
What is the term for the current flowing due to thermionic emission?
What is the term for the emitted electrons in thermionic emission?
What is the term for the emitted electrons in thermionic emission?
What is the term for the minimum energy required to eject an electron from a metal surface?
What is the term for the minimum energy required to eject an electron from a metal surface?
What are the two main categories of electronics?
What are the two main categories of electronics?
What is the force that prevents free electrons from escaping the surface of a metal?
What is the force that prevents free electrons from escaping the surface of a metal?
What is the energy level at which the probability of finding an electron is 50%?
What is the energy level at which the probability of finding an electron is 50%?
What is the minimum energy required to remove an electron from the surface of a metal?
What is the minimum energy required to remove an electron from the surface of a metal?
What is the process of electron emission where electrons are emitted due to thermal energy?
What is the process of electron emission where electrons are emitted due to thermal energy?
What is the work function of oxide-coated tungsten?
What is the work function of oxide-coated tungsten?
What is the direction of dependence of thermion current density on absolute temperature?
What is the direction of dependence of thermion current density on absolute temperature?
What is the unit of the Boltzmann constant in the Richardson-Dushman equation?
What is the unit of the Boltzmann constant in the Richardson-Dushman equation?
What is the exponent of T in the Richardson-Dushman equation?
What is the exponent of T in the Richardson-Dushman equation?
What is the dependence of thermion current density on emission constant A?
What is the dependence of thermion current density on emission constant A?
What is the kinetic energy of an electron required to overcome the barrier potential energy and come out of the metal surface?
What is the kinetic energy of an electron required to overcome the barrier potential energy and come out of the metal surface?
What is the difference between the binding energy and Fermi energy of a metal?
What is the difference between the binding energy and Fermi energy of a metal?
Which of the following types of electron emission requires heat to emit electrons from a metal?
Which of the following types of electron emission requires heat to emit electrons from a metal?
Which type of electron emission does not require an external energy source?
Which type of electron emission does not require an external energy source?
What is the energy level below which an electron is bound to the metal surface?
What is the energy level below which an electron is bound to the metal surface?
What is the effect of increasing the absolute temperature on the exponential term of the Richardson-Dushman equation?
What is the effect of increasing the absolute temperature on the exponential term of the Richardson-Dushman equation?
What is the effect of increasing the emission constant on the current density in the Richardson-Dushman equation?
What is the effect of increasing the emission constant on the current density in the Richardson-Dushman equation?
What is the relationship between the thermion current density and the absolute temperature in the Richardson-Dushman equation?
What is the relationship between the thermion current density and the absolute temperature in the Richardson-Dushman equation?
What is the physical significance of the Boltzmann constant in the Richardson-Dushman equation?
What is the physical significance of the Boltzmann constant in the Richardson-Dushman equation?
What is the primary reason why free electrons in a metal experience a barrier on the surface?
What is the primary reason why free electrons in a metal experience a barrier on the surface?
What is the significance of the Fermi energy level in a metal at 0K temperature?
What is the significance of the Fermi energy level in a metal at 0K temperature?
What is the difference between the binding energy and the Fermi energy of a metal?
What is the difference between the binding energy and the Fermi energy of a metal?
What is the work function of a material related to?
What is the work function of a material related to?
What is the process of electron emission in which electrons are emitted due to an applied electric field?
What is the process of electron emission in which electrons are emitted due to an applied electric field?
