pulsar distance: one weird trick скачать в хорошем качестве

pulsar distance: one weird trick

Support me on Patreon and suggest some video ideas and also get one exclusive video per month:  / acollierastro   4-22. A pulsar emits a broad spectrum of electromagnetic radiation, which is detected with a receiver tuned to the neighborhood of f=80 MHz. Because of the dispersion in group velocity caused by the interstellar plasma, the observed frequency during each pulse drifts at a rate given by df/dt = -5 MHz/sec. (a) If the interstellar magnetic field is negligible and w^2 much bigger than wp^2, show that : df/dt ~ -c/x (f^3/fp^2) where fp is the plasma frequency and x is the distance of the pulsar. (b) If the average electron density in space is 0.2 cm^-3, how far away is the pulsar? (1 parsec =3x10^18 cm.) Link to another coffee and the problem:    • can we space elevator? should we space ele...