DeBroglie Wavelength - Modern Physics - Exam Paper, Exams of Physics

Download DeBroglie Wavelength - Modern Physics - Exam Paper and more Exams Physics in PDF only on Docsity! Test 2 Physics 342 Fall 2004 November 11, 2004 Printed Name: _____________________ ID Number: ________________ Signature:___________________ 1. What is the DeBroglie wavelength in nm of a He atom with kinetic energy of 0.020 eV? The rest mass energy of He is 3727 X 106 eV. See if you can use this to answer. 2. A nucleus emits a gamma ray of energy 1.0 MeV from a state that has a lifetime of 1.2 ns. What is the uncertainty in energy of the ray? 1 3. A particle is confined in a two dimensional box that has of length L along the x direction and 2L along y. Find the lowest levels, in energy, which are degenerate. List the states in terms of quantum numbers nx and ny. 4. An electron is trapped in a one-dimensional square well of length L = 0.132 nm. What is the energy of the n = 10 state in eV? The rest mass energy of an electron is 0.511 X 106 eV. 2