Question

Part A The gas cloud known as the Crab Nebula can be seen with even a small telescope, It is the remnant of a supernova, a cataclysmic explosion of a star. The explosion was seen on the earth on July 4, 1054 a.d. The streamers glow with the characteristic red color of heatod hydrogen gas. In a laboratory on the earth, heated hydrogen produces red light with frequency 4.568 x 1014 Hx; the red light received from streamers in the Crab Nebula pointed toward the earth has frequency 4.586 × 1014 Hz. Estimate the speed with which the outer edges of the Crab Nebula are expanding. Assume that the speed of the center of the nebula relative to the earth is negligible. The speed of light is 3.00 x 108 m/s. Express your answer using two significant figures. IL S Submit Request Answer Part B Assuming that the expansion speed has been constant since the supemova explosion, estimate the diameter of the Crab Nebula in 2004 a.d. Give your answer in light years. Express your answer using two significant figures. ly