Sat 9 Apr, 2016 01:57 pm - A cluster of galaxies is embedded in a cloud of pure hydrogen plasma at a temperature T=107 K with radius 1 Mpc. The mass of the cloud is M=1015 solar masses. Find the frequency at which the... (view)
Sat 9 Apr, 2016 01:55 pm - An astronomer observes radiation coming form a region with a uniform magnetic field B. He notices two narrow absorption features at 0.95 keV and at 1 keV. Find out the magnitude of the magnetic... (view)
