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Radio Telescopes Radio telescopes detect radio waves emitted by objects throughout the universe. They do not detect the visible light from stars and galaxies. The Dominion Radio Astrophysical Observatory (DRAO), located in Penticton, B.C., has a seven- antenna radio telescope. Using signals from this telescope, the observatory produces detailed wide-angle pictures of the radio sky. One of the radio waves that this telescope detected had a frequency of 1 420 MHz, and came from an arm of the Milky Way Galaxy that is 7.00 x 1018 km away. 10. The amount of time, in days, that it took these 1420 MHz radio waves to travel from their source to the DRAO was 0 6.5 x 109 days 32.3 x 1013 days 0 2.0 x 1018 days O 2.7 x 108 days When an X-ray passes through a crystal, it forms a second anti-nodal line (constructive interference) on a screen at an angle of deviation of 6.00. The crystal acts as a diffraction grating with a line spacing of 4.00 x 10-10 m. The distance to the screen is 1.80 m. The wavelength of the X-ray, expressed in scientific notation, is a.b x 1050 m. The values of a, b, c, and d are .(Record your 4 digits answer)