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Final-Fall2007-08

# Final-Fall2007-08 - PHYSICS 205 TIME 120 minutes Feb 1 2008...

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PHYSICS 205 TIME: 120 minutes Feb. 1, 2008 DO NOT OPEN THIS EXAM BEFORE YOU ARE TOLD TO BEGIN NAME________________________________________________ ID Number ________________________ Useful information Mass of the electron m e = 9.1x10 -31 kg. h = 6.63x10 -34 J.s; c = 3.00x10 8 m/s; e=1.60x10 -19 C. k e =8.9875x10 9 Nm 2 /C 2 Compton wavelength = 0.00243 nm Grading A B C TOTAL Score:________ Check if solution is continued on the back. 1

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Part A (18%): 1.(3%) State the two postulates of general relativity. X A Z 2. (3%) Explain the meaning of all the symbols used in the formula 3. (3%) A set of 3 capacitors and 3 resistors are wired in series in two independent circuits, determine the equivalent capacitance and resistor. Score:________ Check if solution is continued on the back. 2
4. (3%) In which direction is the force exerted on a current-carrying wire located in an external magnetic field. Explain. 5. (3%) Explain why some nuclei are more stable than others. 6. (3%) Explain what is the de Broglie wavelength and its relation to the dual nature of matter. Score:________ Check if solution is continued on the back. 3

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