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Unformatted text preview: It is observed that iF a pulse is detected at Frequency ω at time t , a pulse at Frequency ω + Δ ω will be detected at time t + Δ t . ±ind the relation between Δ t , Δ ω , and the dispersive measure DM = Z L n e dl, where L is the distance to a neutron star, n e is the electron number density, and dl an element oF path length along the line oF sight. Discuss the sign oF Δ t/ Δ ω . (C). Consider the Following data For the neutron star PSR 0950 + 08: THe average density Fo 1 electrons in the solar neighborhood is 0 . 03 cm3 . Find the distance to PSR 0950 + 08. (D). The observed dispersion in the data for PSR 0950 + 08 could be due in part to the photon having a ±nite mass. Find an upper limit to the mass of the photon. 4. Jackson problem 7.14. 5. Jackson problem 7.19. 2...
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 Fall '11
 Electrodynamics
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