Nuclear & Entanglement
Below is an example of what type of nuclear decay?
n0 -> p+ + e- + ve
β- decay
How does the final intensity after the polarizer compare to the starting intensity when unpolarized light travels through a polarizer?
It is half the initial intensity
What is the formula for the energy difference between energy levels in a quantum harmonic oscillator?
Em-En = ℏω
What is the name of the approximation we can use to say that sinθ≈θ and tanθ≈θ?
The Small Angle approximation
What is the complex conjugate for the following complex equation?
S = 36e2i
S* = 36e-2i
The symbolic representation for Carbon-14 is 146 C, how many neutrons are present in this isotope of carbon?
8 neutrons
Silver metal is a good conductor, what does this tell you about its band gap?
There is no gap
What is one difference between an infinite square well and a quantum harmonic oscillator?
Even versus uneven energy differences, the equation used for each one, whether n starts at 0 or 1, other ideas as well
What law of geometry do we use when trying to add two amplitudes with some phase difference between them?
Bonus 100 points for telling me the equation
Law of Cosines
At2=A12+A22+2A1A2cosΔθ
What is the value for the area underneath a probability distribution from -∞ to +∞?
1
Name one of the two forces that provide nuclear stability.
Coulomb force or strong nuclear force
The final intensity is zero, perpendicular angles
In an infinite square well, between what two n energy levels would the longest wavelength be emitted or absorbed?
Between n=1 and n=2
Name two types of diffractions that have been discussed this semester
Single slit, double slit, and circular aperature
What is Euler's Identity?
eiθ = cosθ+isinθ
Which of the following is not conserved during a decay?
a. Energy
b. Mass
c. Lepton number
d. Total charge
b. Mass
When looking through an infrared camera you see that you can look through a black plastic bag, what does this tell you about its band gap?
a. The gap is too large for infrared wavelengths
b. The gap is too small for infrared wavelengths
c. The plastic bag is actually just clear
a. The gap is too large for infrared wavelengths
What is the main idea behind the Pauli Exclusion principle?
At most, only two electrons may occupy an energy level. If there are two then they must have opposing spins
If this is the equation for our wave, in which direction is the wave propagating along?
y(z,t) = Acos(-kz-ωt+φ)
The negative z direction
When studying the photoelectric effect students found that shining a red laser on a sheet of metal resulted in no electrons escaping from the metal. What would happen is the students had instead used a brighter laser of the same color?
Nothing would change, still no electrons escape from the metal
How do you determine the energy released during a decay?
Use the mass difference
Semiconductors are named so for a reason, they are able to behave as both an insulator and a conductor. Why is this possible?
Small band gap energy, changes properties with changing temperatures
In eV, how much energy is associated with the ground state of a hydrogen atom? (make sure to include the sign)
-13.6 eV
For the interferometers that have been discussed in this course, why is I0 a quarter of the intensity from the source?
The final interfering wave have been split two times
Using the Heisenberg Principle, if we are very certain about a particle's position, how confident or certain are we of its momentum?
Not confident or very uncertain