College Physics
Unit 7 Modern Physics Presentations
This project is 50% of your Final Exam for Second Semester
Mrs. Ashley
Name ______________________________________
#1 Modern Physics Assignment: Due May 26 Grant
Please prepare a lesson to teach pages 726-737 including exercise C
Be sure to explain the equation 26-1a and 26-1b and 26-2
Here is the Problem you are to have students do:
#1. What will be the mean lifetime of a muon as measured in the laboratory if it is traveling at
v = 0.60 c = 1.80 X 10-6 m/s with respect to the laboratory? Its mean lifetime at rest is
2.20 s = 2.20 X 10-6 s. How far does a muon travel in the laboratory on average, before decaying?
#2 Modern Physics Assignment: Due May 26 Ryan
Please prepare a lesson to teach pages 737 (Space travel) - 741 (whole page)
Be sure to explain 26-3a and 26-3b;
#2. Escape velocity from the Earth is 40,000 km/m. What would be the percent decrease in length of a
95.2 meter long spacecraft traveling at that speed?
#3 Modern Physics Assignment: Due May 26 Molly
Please prepare a lesson to teach pages 742-747
Be sure to explain: 26-4 and 26-5; 26-6a'; 26-6b; 26-7a and 26-7b and 26-8
#3. Calculate the kinetic energy and momentum of a proton traveling 2.60 X 108 m/s
#4 Modern Physics Assignment: Due May 26 Brad
Please prepare a lesson to teach pages 754-758 (stop at 27-3)
Be sure to explain 27-2 and 27-3
#4. How hot is a metal being welded if it radiates most strongly at 440 nm?
#5 Modern Physics Assignment: Due May 28 Gianna
Please prepare a lesson to teach pages 758 (start at 27-3)-763 (stop at 27-5)
Be sure to explain 27-4; 27-5a; 27-5b; 27-6
#5. What is the maximum kinetic energy of electrons ejected from barium (Wo =2.48 eV) when
illuminated by white light, = 400 to 750 nm?
#6 Modern Physics Assignment: Due May 28 Christina
Please prepare a lesson to teach pages 763 (start at 27-5)-766 (stop at 27-8)
Be sure to explain: 27-7
#6. An electron and a positron each moving at 1.0 X 105 m/s collision head on, disappear, and produce
two photons, each with the same energy and momentum moving in opposite directions. What is the
energy and momentum of each photon?
#7 Modern Physics Assignment: Due May 28 Kevin
Please prepare a lesson to teach pages 766 (start at 27-8)-773 (stop at 27-12)
Be sure to explain: 27-8; 27-9
#7. An Electron has a de Broglie wavelength  = 5.0 X 10-10 m. What is its momentum? What is its
speed? What voltage was needed to accelerate it to this speed?
#8 Modern Physics Assignment: Due May 29 Joe
Please prepare a lesson to teach pages 773 (start at 27-12)-779.
Be sure to explain: 27-10; 27-11; 27-12; 27-14; 27-15b
#8. How much energy is needed to ionize a hydrogen atom in the n = 2 state?
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#9 Modern Physics Assignment: Due May 29 J.T.
Please prepare a lesson to teach pages 786-793.
Be sure to explain:28-1; 28-2;
#9. An electron remains in an excited state of an atom for typically 10-8 s. What is the minimum
uncertainty in the energy of the state (in eV)?
#10 Modern Physics Assignment: Due May 29 Mike
Please prepare a lesson to teach pages 794-802 (stop at 28-10).
Be sure to explain: 28-3; 28-4
#10. Suppose a certain hydrogen atom has I = 4. What are the possible values for n, m1, m2 ?