Modern Physics Review Sheet

1.  Which 2 experiments proved light is a particle? ________________
2.  What is a photon?

3.  Which color of light has the greatest energy? _____________

Smallest energy? _____________ Why? _____________
4.  What is the energy of a photon with a frequency of 6.0 x 1014 Hz ?

5.  If the frequency of light is decreased how does that affect its energy? ______

Show the equation that relates these 2 variables ___________
Sketch a plot of these 2 variables
 
 

5a) What is the relationship between the energy of a photon and its wavelength?
 
___________ Sketch a plot of these 2 variables 

6. What is the relationship between the wavelength of a particle and its momentum?
 
Sketch plot
 

7.  Why is it difficult to observe the wave behavior of a moving basketball?
 

8.  What did Rutherford's experiment tell us about the atom?

____________________  ______________________   _________________

9.  What does an electron in an atom have to do to lose energy? Go up or down an energy level.
 

9a) The lowest energy an electron can be in is called the ____________ state.
 10.  How much energy does it take to ionize an electron of hydrogen in the 1st

energy level?    ___________________________

How much energy does it take to ionize an electron in the B level in mercury?
 

11. How much energy must an electron in hydrogen have to absorb to go from the 3rd to the 4th energy level?
 
12. What angle will an alpha particle come back at if it hits straight on?______

12a) How will the deflection angle change as an alpha particle comes closer to a nuclei?
 
 

13. Draw the path of an alpha particle that comes near the nucleus. Now draw the path of an alpha particle that comes closer to the nucleus.
 
 

14. What is an “electron cloud” in the new model of the atoms?
 
 
 
15. What is the binding energy of the atom and where does it come from?
 
 
16. Describe the force that holds the nucleus together.
 

17. How much energy can you get when 2 kg of mass is converted to energy?
 
 
 
17a) How much energy can you get when 2 universal mass unit of mass is converted to energy?
 
 
 
17b) How much energy can you get when a neutron is converted to energy?
 
 
18. What energy can an atom with the following energy levels absorb to change energy levels?   –20, - 15, - 2 (remember to remove the negatives before subtracting)
 
 

19. Name three quarks from your reference table.

20. Give two examples of baryons.
 

21. How many different amounts of energy can an atom with 3 energy levels emit?
a) how many different colors? ____ b) how many different photons? ______