Read the introductory material for this lab session.

Consider the following graph (reproduced from the introduction) for the stopping potential against the cut-off frequency

How could you calculate Plank's constant from this graph?

The Wratten Filters have a 'sharp cut-off', and essentially only cut out frequencies higher than their rated frequency, and let through lower frequencies.  

The energy level diagram for a helium ion (He_⁺) is shown below.

How much energy is required to remove the remaining electron from the helium ion?

You may assume that He^₊ is initially in its ground state. 

Which statement about the Bohr model of the hydrogen atom is correct?

According to classical physics radiation emitted from a hydrogen atom should exhibit: 

In Rutherford’s scattering experiment, particles were fired at a thin gold foil.

What particles were used in this experiment?

For the remainder of your assessment please complete this google form, which will ask that you enter your measurements and the results of your analysis, and to also provide some discussions and conclusions. This form will allow us to check your results and discussions and conclusions in the context of your particular measurements, and will then provide the second part of your mark for this activity. (This quiz provides 4 marks and the google doc contains the entries for another 8 marks). 

Note: this question requires no answer here, just fill out the google form :) 

In part B, you work with the axes

Using Python and "Y" as the symbol for , "l" (a lowercase L) as the symbol for and "D" as the symbol for , and placing a u in front of each of these for the uncertainty in these variables (e.g. uY, ul and uD), work out a symbolic expression for the uncertainty in , Then print the symbolic expression and copy and paste the output of this print call directly into the input cell below without any changes. 

E.g. if your expression is called expr_u_y, add the line

print(expr_u_y)

to your code and copy from the terminal or console the output that this line generates and paste this into the text cell. 

IMPORTANT NOTE: Make sure to use the method in Python and Uncertainties and to print the result of that, part of the assessment for labs is specifically learning python, so it is important to practice the coding, and this question can only be answered correctly if you use the python method in the Python and Uncertainties activity. 

Below are four different intensity patterns that result from using for different slit setups.

Match each intensity pattern to the description of the slit(s) which produced them.

For the cases of double slits, the spacing between the slits is always the same.

When talking about wide and narrow, we mean widths that are just slightly wider or slightly narrower than 0.1mm. 

Assume that the wavelength of the laser and the distance to the screen is the same for all the different patterns.

Consider the following two patterns produced by double slit 1:

and double slit 2:

Which of the following is true?