A radio burst from a distant source is detected in two frequency channels

PHYSICS · Subjective · Fermi University Physics · Plasma Physics · Waves in plasmas · Waves in plasmas

Modes, Packets and Media, Ch Transmission lines and electromagnetic waves in matter, plasmas and guides

Problem

A radio burst from a distant source is detected in two frequency channels. Its arrival at

0.80\,\mathrm{GHz}

50\,\mathrm{ms}

later than its arrival at

1.60\,\mathrm{GHz}

. Using

\Delta t = 4.149\,\mathrm{ms}\times\mathrm{DM}\times(f_1^{-2} - f_2^{-2})

with

\mathrm{DM}

\mathrm{pc\,cm^{-3}}

and

f_1 < f_2

\mathrm{GHz}

, find the dispersion measure of the path.