Chapter 7: Quantum Mechanics Flashcards
What doe the wave equation apply to?
It applies to any measured value that is a function of position at a given time or to any measured value that is a function of time at a given position.
What is the name and symbol for the distance between two adjacent crests peaks (or any two analogous points) on a wave?
Wavelength - λ (lamda)
What is the name and symbol for the time between the two peaks, or the time it takes to complete one cycle?
Period - T
Frequency, symbol _____, is inversely proportional to _____.
v
T
(so V= 1/T)
When wave moves does any matter actually change position when referring to light or sound waves?
No matter changes position, only the crest (or any other point on the wave), appears to change position.
What is phase velocity?
The velocity at which the trough (or peak, or other) appears to move
Phase velocity is proportional to _____ and inversely proportional to _____.
wavelength (λ)
period (T)
(phase velocity=λ/T)
Phase velocity is proportional to ____ and ____.
wavelength (λ)
Frequency (ⱱ)
(phase velocity=λ∙ⱱ)
What is the phase velocity of electromagnetic radiation (light in particular)?
3.00 x 10^8 m/s
In which region of the electromagnetic spectrum does light exist?
From λ 400 nm to 750 nm
λ 400nm is ____ light
voilet
λ 750nm is ____ light
red
Is it possible to measure the frequency of lIght? If not how do we figure it out?
No, though we can calculate it multiplying the wavelength and phase velocity
How do we measure the wavelength of light?
Through constructive and destructive interference
Constructive interference occurs when the waves are ______ phase.
Destructive interference occurs when waves are _____ phase.
in
out of
In the double slit experiment what occurs in the halfway point between the two slits?
A bright spot
Why does a bright spot occur halfway between the two slits in the double slit experiment?
It occurs because at this point both of the waves travelling from the slit have traveled the same distance, and because they both have the same source and therefore wavelength, constructive interference occurs and the light therefore appears brighter
As you travel away from the halfway point in the double slit experiment what pattern occurs and why?
A pattern of light and dark occurs, this is because when you move away the length the wave has to travel increases for one and decreases for the other so the are either in or out of phase, due to the length the wave must travel. this creates alternating constructive and destructive interference.
What does the quantum-mechanical model of the atom explain?
It explains how electrons exist in atoms and how those electrons determine the chemical and physical properties of elements
What common characteristic do both light and electrons share?
Wave -particle duality
What is electromagnetic radiation?
A type of energy embodied in oscillating electric and magnetic fields
Light is…..?
Electromagnetic radiation
What is an electric field?
A region of space where an electrically charged particle experiences a force
What is a magnetic field?
A region of space where a magnetic particle experiences a force