phys0001_assignment02_ans

# phys0001_assignment02_ans - Solutions of Assignment 2 Due...

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Solutions of Assignment 2 Due date: November 6, 2009 1) a) Let f orig , l orig , f obs and l obs be the original frequency, wavelength and the observed frequency and wavelength respectively. We have v / c = (l obs - l orig ) / (l orig ) = (c / f obs – c / f orig ) / (c / f orig ) = (f orig - f obs ) / (f obs ) (Remark: We derive this from the Doppler formula in the lecture note and the relation between wavelength and frequency. Both formulae about Doppler's effect are approximation to the more accurate one, which takes into the relativistic effect.) b) The frequency of the H-alpha line is 4.57x10 14 Hz. c) By the equation found in (a), the radial speed is 0.0133c = 4.0x10 6 m/s. The star is going away from us. 2) a) No. According to Kepler's second law, the satellite will travel a greater distance in the same interval of time when it is closer to the Sun than when it is far away. As a result, it will attain its maximum orbital speed when it is closest to the Sun. b)

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## This note was uploaded on 10/14/2010 for the course BSC phy1001 taught by Professor Prof during the Spring '10 term at HKU.

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phys0001_assignment02_ans - Solutions of Assignment 2 Due...

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