ex00.pdf - Physics 5110 Spring 2015 Preliminary Quiz Name No course points are at stake here This is to provide the instructor with information about

ex00.pdf - Physics 5110 Spring 2015 Preliminary Quiz Name...

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Physics 5110, Spring 2015 Name: Preliminary Quiz . No course points are at stake here; This is to provide the instructor with information about your prior courses. Please answer each question in the space provided. A calculator is not required. 1. Give order-of-magnitude size estimates for: (a) an atom. (b) an atomic nucleus. (c) one wavelength of red light. 2. You wish to measure the ratio of charge to mass ( q/m ) for an electron. You have at your dis- posal an “electron gun” which emits electrons with known speed v , and a uniform magnetic field of known magnitude B . How do you measure q/m ? Give relevant equations. 3. (a) A particle of mass
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Unformatted text preview: m p , at rest in the lab, decays into two particles of massm d = 100 MeV/c 2 . The total energy of each particle of massm d is 250 MeV. What is the massm p ? (b) A spaceship with length L is travelling with speed radicalBig 3 / 4 c with respect to you. Whatis the length of the spaceship in your frame of reference? 4. Write down the time-independent Schr¨ odinger Equation for the electron in a hydrogen atom.5. Atoms with atomic number z ≥ 3 have only two electrons in the innermost n = 1 shell. Explain why this is the case. Hint: A three-word answer will suffice....
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