ECEN 370 Final Exam Review
questions and answers
Particle Model for an Electron - correct answer ✔✔ describes the electron as a point like
particle that occupies quantized energy levels within atoms (ohms law, hall effect)
Wave model for an Electron - correct answer ✔✔ describes the electron as waves rather than
discrete particles
Mean Free Path - correct answer ✔✔ average distance a molecule travels between collisions
Mean Free Time - correct answer ✔✔ average time between collisions of a particle
Drift Mobility - correct answer ✔✔ average drift velocity of charge carriers to the electric field
strength
Drift Velocity - correct answer ✔✔ the average velocity at which free charges flow in response
to an electric field
Lorentz Force - correct answer ✔✔ the sum of the electrostatic and magnetic forces acting on a
charge
Hall Effect - correct answer ✔✔ the deflection of electrons in a semiconductor with current
flowing perpendicular to a magnetic field
De Broglie's Relationship - correct answer ✔✔ wavelength = h/p
, Uncertainty Principle - correct answer ✔✔ states that it is impossible to know both the precise
location and precise velocity of a subatomic particle at the same time
Why classical mechanics failed to explain electron behavior - correct answer ✔✔ it fails to
explain the absence of lag time, the presence of a cut off frequency, and the photoelectric
effect.
Planck (1900) - correct answer ✔✔ introduced quantization suggesting energy is emitted, laying
the foundation of quantum theory
De Broglie (1924) - correct answer ✔✔ proposed wave-particle duality, suggesting particles
have associated wavelengths, leading to wave mechanics
Einstein (1905) - correct answer ✔✔ explained the photoelectric effect with quantized light
energy
Bohr (1913) - correct answer ✔✔ developed the bohr model of he atom, incorporating
quantization and discrete electron energy fields
Schrodinger (1926) - correct answer ✔✔ formulated wave mechanics with the Schrodinger
equation
Interpretation of electron wave function - correct answer ✔✔ represents the probability
amplitude of finding an electron at a given position in space
Energy potential barrier/well - correct answer ✔✔ regions in a physical system where the
energy is higher or lower than their surroundings
questions and answers
Particle Model for an Electron - correct answer ✔✔ describes the electron as a point like
particle that occupies quantized energy levels within atoms (ohms law, hall effect)
Wave model for an Electron - correct answer ✔✔ describes the electron as waves rather than
discrete particles
Mean Free Path - correct answer ✔✔ average distance a molecule travels between collisions
Mean Free Time - correct answer ✔✔ average time between collisions of a particle
Drift Mobility - correct answer ✔✔ average drift velocity of charge carriers to the electric field
strength
Drift Velocity - correct answer ✔✔ the average velocity at which free charges flow in response
to an electric field
Lorentz Force - correct answer ✔✔ the sum of the electrostatic and magnetic forces acting on a
charge
Hall Effect - correct answer ✔✔ the deflection of electrons in a semiconductor with current
flowing perpendicular to a magnetic field
De Broglie's Relationship - correct answer ✔✔ wavelength = h/p
, Uncertainty Principle - correct answer ✔✔ states that it is impossible to know both the precise
location and precise velocity of a subatomic particle at the same time
Why classical mechanics failed to explain electron behavior - correct answer ✔✔ it fails to
explain the absence of lag time, the presence of a cut off frequency, and the photoelectric
effect.
Planck (1900) - correct answer ✔✔ introduced quantization suggesting energy is emitted, laying
the foundation of quantum theory
De Broglie (1924) - correct answer ✔✔ proposed wave-particle duality, suggesting particles
have associated wavelengths, leading to wave mechanics
Einstein (1905) - correct answer ✔✔ explained the photoelectric effect with quantized light
energy
Bohr (1913) - correct answer ✔✔ developed the bohr model of he atom, incorporating
quantization and discrete electron energy fields
Schrodinger (1926) - correct answer ✔✔ formulated wave mechanics with the Schrodinger
equation
Interpretation of electron wave function - correct answer ✔✔ represents the probability
amplitude of finding an electron at a given position in space
Energy potential barrier/well - correct answer ✔✔ regions in a physical system where the
energy is higher or lower than their surroundings
