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In an online textbook, the following formula is given to calculate the arrival time delay between two frequencies, $v_1, v_2$ in a dispersed radio pulse:

$$t_1 - t_2 = 4.15 \cdot DM [(v_1/\text{GHz})^{-2} - (v_2/\text{GHz})^{-2}]$$

Where does the $4.15$ come from, and what exactly is “GHz”? Do I divide by 1 GHz or?

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  • $\begingroup$ Can you provide a link to where you found the equation online? That would help provide more context for your question. $\endgroup$ – ELNJ Jul 24 at 1:12

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