To estimate the integral and average characteristics of interstellar plasma, one can use an experimental fact established immediately after the discovery of pulsars. It turned out that due to plasma dispersion, pulses of radio emission from pulsars at lower frequencies always lag behind pulses at higher frequencies. Consider the following idealized example. Two monochromatic signals with wavelengths l1 = 3 cm and l2 = 5 cm propagate in the plasma. Determine the total number n of free e

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