{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# PhyLab10 - Chapter 10 Modern Physics Abstract The purpose...

This preview shows pages 1–2. Sign up to view the full content.

Chapter 10: Modern Physics Abstract: The purpose of this experiment was to explore several phenomena that are relevant to the field of modern physics. First, the speed of light was calculated by measuring the time it took for light to travel through a fiber optic cable of known length and index of refraction. The charge-to-mass ratio was supposed to be calculated using an electron tube with Helmholtz coils, but the apparatus was not working on the day of the experiment. Finally, an experiment was performed to calculate Planck’s constant by measuring the knee voltage through LEDs of known frequency. 10.1 The Speed of Light 1. Time required to move through cable is 104 ns. 2. ( d/ t)= (20m/104e-9 sec) = 1.923e8 m/s 3. V = c/n Vn = c = [(1.923e8)(1.5)] = 2.8845e8 m/s 4. [abs(2.8845e8 – 3 e8)/3 e8] x 100 = 3.85% 5. Some possible sources of error for this experiment are with the oscilloscope itself as it has built in limits to its accuracy, and limits to the precision because we measure the change in time by placing the cursors with our eyes inexact. 6. Fizeau used a toothed wheel to help him measure the time taken for light to travel 12 miles. A converging lens gathered up the light rays from a powerful light source. A plate of glass was placed at an angle to these rays just before they would have been brought to a focus. Instead, the light rays were reflected and brought to a focus on one side of the glass plate. These rays were made parallel by a collimating lens placed so that the actual light focus coincided with the principal focus of the lens. The

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern