MATH 110 Midterm: Exam 4 No Solutions Fall 1996
14 Mar 2019
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No calculators or books are needed or permitted. However, a formula sheet (six pages of us letter size paper) is allowed. Even if you don"t know how to solve the problem, state in words what you think is happening and why. Express all answers in terms of the variables de ned in the problem. 1: [15 points] an intense light of wavelength shines on a photocathode with work func- tion . The anode is at a more negative voltage v which is su cient to stop all but the most energetic photo-electrons. However, the anode has a small hole so some electrons. They travel around half a circle, and then hit a phosphor screen, allowing us to measure the radius of the circular orbit. Light shines on the cathode and kicks photo-electrons. Most energetic photo-electrons pass through a hole in the anode and enter magnetic field b.
