Hello, I have two physics problems I'm having difficulty with. Can someone help me? 1) A shift of one fringe in the Michelson-Morley experiment would result from a difference of one wavelength or a change of one period of vibration in the round-trip travel of the light when the interferometer is rotated by 90°. What speed would Michelson have computed for Earth's motion through the ether had the experiment seen a shift of one fringe? 2) Consider two inertial reference frames. When an observer in each frame measures the following quantities, which measurements made by the two observers must yield the same results? (Select all that apply.) the distance between two events the value of the mass of a proton the speed of light the time interval between two events Newton's first law the order of the elements in the periodic table the value of the electron charge Thank you for your help!!!