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# Final - _I PHYSICS 205 FINAL EXAM 1 What is the ratio of...

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Unformatted text preview: ..__I . PHYSICS 205 - FINAL EXAM 1. What is the ratio of the wavelengths of a 200 eV photon and a 200 eV electron? '2. Five equal charges Q are equally spaced on a semicircle of radius R. Find the force on a charge q locatedas shown. 3. Three concentric spherical thin conducting shells have radii a < b < 0. Initially the inner shell is not charged, the middle shell has a positive charge *t Q and the outer shell has a negative charge —Q. Find the electric potential of the three shells. 4. Design a network of capacitors that has a capacitance of 2 nF and a breakdown voltage of 400 V using as many 2 nF capacitors that have individual breakdown voltages of 100 V as needed. '0 (a F l i'g'fL )\ initially uncharged. a)What is the initial If . I; . The capacitors in the circuit shown are ﬁlm? ' \ battery current when the switch is closed. 5”: b)What is the battery current after a long time. / . N c) What are the final charges on the ca pacrtors? I Q _Q_ ll__—.— 50V . A metal bar of mass M, resistance R and length L rides on a pair of long frictionless perfectly conducting rails that are inclined so that they make an angle 8 with the horizontal. The rails are connected to a battery V. The bar is released from rest in the presence of a vertical magnetic ﬁeld B. Describe the subsequent motion. Find the final value of the current. 7. A series LRC circuit is driven at a frequency of 500 Hz. An oscilloscope measurement determines the phase angle between current and voltage to be 75° . IfR=3SQ and L=0.15 H, Find C. 8. An X—ray undergoes scattering by a stationary free electron and emerges with a wavelength of 0.2 nm at an angle of 100° . What is the kinetic energy of the scattering electron? 9. What is the radius of 56Fe nucleus? 10. Find the binding energy per nucleon of 7Li . 11. The neutron decays into a proton. Write the equation for this decay. What the energy released in this decay? Where does this energy go? 12. The counting rate of a radioactive source is 8000/5 at t=0. 10 min later ' the rate is 1000/5. What is: a) The half life, b) the decay constant and c) the count rate at t=30 min? atomic mass of (atomic mass units) 7Li = 7.016004 ‘11 = 1.007325 neutron = 1.008665 electron = 0.000548 1 amu = 931.5 Mews2 August 1996. ...
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