Question

38. Astronomers studying the light from calcium atoms located in a galaxy in the constellation Bootes find that the spectral lines are shifted toward the red end of the spectrum The redshift indicates that the galaxy is moving away at a speed of 3.9 x 106 ms. What is the distance (in light - years) to the galaxy? A) 4.7 x 10° light-years B) 23 x 10$ light-years C) 1.1 x 10 light years D) 8.4 x 106 light-years E) 6.6 x 104 light years 39. Complete the following statement: The Michelson-Morley experiment A) confirmed that time dilation occurs. B) proved that length contraction occurs. verified the conservation of momentum in inertial reference frames. D) supported the relationship between mass and energy. E) indicated that the speed of light is the same in all inertial reference frames. 40. When 20 fissions, the products might be: A) Bar and a proton B) Bar and a neutron C) 14. Cs DIST and an alpha particle E) two uranium nuclei and

Answer 1

38 By Hubble's law V = Hod & HO = 70 km/s mpc V = 3.9 Xloºmis 6 3.9810 7 da Мрс to x103 3.9x10 x 3.26X109 by 3 70 x 10 8 (B) 2.3x10° light years (39) (E) light Indicated that the speed of is same in all inertial referen frames. rence (40) 236 U 146 56 Ba t 89 kr t'm 92 36 (B) 146 5G Ba 89 36. Br and a neutron 2