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

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Unformatted text preview: 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 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 Part B (33%): 1. (3%) The astronaut whose heart rate on Earth is 60 beats/min increases his velocity to v = 0.80 c . What is now his heart rate as measured by an Earth observer? a . 36 beats/min b. 48 beats/min c. 75 beats/min d. 100 beats/min 2. (3%) Two identical extremely accurate clocks are installed on the Eiffel tour, one on the top and the other near the base. Which statement is correct? on the top and the other near the base....
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This note was uploaded on 01/06/2012 for the course PHYS 205 taught by Professor Antar during the Spring '09 term at American University of Beirut.

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

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