Demonstration of GitHub Classroom Q & A#
👨🏫 Purpose#
GitHub Classroom not only allows us to automatically test programming/code. Other types of questions are supported too.
🎲 Multiple-Choice Questions (one or more answers, separated by spaces or commas)
🪙 True/False Questions (write True/False)
🖩 Numerical answers requiring some calculation (write the numerical answer in the requested units; significant figures are not checked)
🧮 Numerical answers requiring no calculation (usually just counting) (write the answer as a number)
🔀 Matching Questions (write pairs sequentially).
The way we do it, it is important that you always put your answer in the indicated position and never use the bold-faced word “Answer” elsewhere. Other than that restriction, the rest of your notebook is yours to play with.
📜 Instructions#
The next few questions demonstrate the workflow. For each question type, you are first given an example; then you need to do another question of the same type on your own.
You can upload files to show your mathematical work; you can also type mathematics using Markdown.
You can use the notebook as a calculator for numerical problems; but you can also just type in your answer computed offline.
You may find these sheets containing reference data and mathematical formulas/identities useful.
1. 🎲 Which of the following phenomena are strongly associated with the particle-like nature of light.
A. Blackbody radiation
B. Compton Scattering
C. Electron Diffraction
D. Stern-Gerlach Experiment
E. Photoelectric effect
Answer: A, E, B
More information can be found in the course notes.
2. 🎲 Which of the following changes would double the energy of a photon:
A. Doubling its frequency
B. Doubling its wavelength
C. Doubling its momentum
D. Doubling its speed
E. Doubling its effective (relativistic) mass
F. Doubling its wavenumber.
Answer:
3. 🪙 Doubling the wavelength of radiation doubles its frequency. (True/False)
Answer: False
The wavelength, \(\lambda\), of light is related to frequency, \(\nu\) by the equation \(\nu = \frac{c}{\lambda}\). So doubling the wavelength halves the frequency.
4. 🪙 Doubling the wavelength of radiation halves its speed. (True/False)
Answer:
5. 🖩 A helium-neon laser emits light at 632.8 nm. What is the energy of the photons generated by this laser, in Joules?
Answer: 3.139e-19
import numpy
import scipy
from scipy import constants
Energy = constants.h*constants.c/632.8e-9
print("Energy of the photon in Joules", Energy)
Energy of the photon in Joules 3.139136942397169e-19
Using the formula \(E = \frac{h c}{\lambda}\).
6. 🖩 What is the frequency of light in Hz (\(s^{-1}\)) of light with wavelength 500 nm?
Answer:
7. 🧮 Two quantum particles move at the same speed, but particle 2 has half the mass of particle 1. The De Broglie wavelength of particle 2 is greater than that of particle 1 by a factor of ____?
Answer: 2
The De Broglie wavelength is \(\lambda = \frac{h}{p}\). Halving the mass of a particle halves its momentum and doubles its wavelength.
8. 🧮 When light with wavelength 600 nm shines on a metal surface, electrons are photoelectrically ejected. Next, a light with wavelength 300 nm is shone on the surface. The kinetic energy of the emitted electrons increases by a factor of ____?
Answer:
See the course notes.
9. 🔀 Assign the following equations to the person most strongly associated with them.
Person |
Equation |
|---|---|
A. De Broglie |
1. \(\, E=h \nu\) |
B. Einstein |
2. \(\, p=\frac{h}{\lambda}\) |
C. Planck |
3. \(\, \text{Kinetic Energy} = h \nu - W\) |
D. Rydberg |
4. \(\, h \nu \propto \frac{1}{m^2} - \frac{1}{n^2}\) |
Answer: A, 2, B, 3, C, 1, D, 4
10. 🔀 Assign the following types of experiment to the person most strongly associated with them.
Person |
Experiment |
|---|---|
A. Davisson and Germer |
1. Electron Scattering |
B. Compton |
2. Photon Scattering |
Answer: