Simple Nature - Light and Matter

of light would look like to a person riding a motorcycle alongside it,Einstein eventually came up with a radical new way of describingthe universe, in which space and time are distorted as measuredby observers in different states of motion. As a consequence of thisTheory of Relativity, he showed that light waves would have Dopplershifts that would exactly, not just approximately, depend only onthe relative motion of the source and receiver.Discussion QuestionsA If an airplane travels at exactly the speed of sound, what would bethe wavelength of the forward-emitted part of the sound waves it emitted?How should this be interpreted, and what would actually happen? Whathappens if it’s going faster than the speed of sound? Can you use this toexplain what you see in figures aa and ab?B If bullets go slower than the speed of sound, why can a supersonicfighter plane catch up to its own sound, but not to its own bullets?C If someone inside a plane is talking to you, should their speech beDoppler shifted?Section 6.1 Free Waves 359