PHYS 214 Final Exam Jeopardy

Nuclear & Entanglement

100

Below is an example of what type of nuclear decay?

n⁰ -> p⁺ + e^- + v_e

β- decay

200

The symbolic representation for Carbon-14 is ¹⁴₆ C, how many neutrons are present in this isotope of carbon?

8 neutrons

300

Name one of the two forces that provide nuclear stability.

Coulomb force or strong nuclear force

400

Which of the following is not conserved during a decay?

a. Energy

b. Mass

c. Lepton number

d. Total charge

b. Mass

500

How do you determine the energy released during a decay?

Use the mass difference

Polarization, Spin, and Band Gap

100

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

200

Silver metal is a good conductor, what does this tell you about its band gap?

There is no gap

300

Light polarized along 30 degrees N of E passes through a polarizer that is aligned along 120 degree N of E, what is the final intensity of the light after the polarizer?

The final intensity is zero, perpendicular angles

400

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

500

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

Energy and Multiple Electrons

100

What is the formula for the energy difference between energy levels in a quantum harmonic oscillator?

E_m-E_n = ℏω 

200

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

300

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

400

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

500

In eV, how much energy is associated with the ground state of a hydrogen atom? (make sure to include the sign)

-13.6 eV

Exam 1 Review

100

What is the name of the approximation we can use to say that sinθ≈θ and tanθ≈θ? 

The Small Angle approximation

200

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

A_t²=A₁²+A₂²+2A₁A₂cosΔθ 

300

Name two types of diffractions that have been discussed this semester

Single slit, double slit, and circular aperature

400

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

500

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

Exam 2 Review

100

What is the complex conjugate for the following complex equation?

S = 36e²ⁱ

S* = 36e^-2i

200

What is the value for the area underneath a probability distribution from -∞ to +∞?

1

300

What is Euler's Identity?

e^iθ = cosθ+isinθ 

400

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

500

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