41. The only difference between each of these lines is the doppler shift that each of these lines has. 42. These widths are due to Doppler shifts caused by the high speeds of the gas emitting the lines. 43. Frequency offsets are typically caused by mismatched transmitter and receiver oscillators, or by Doppler shift due to movement. 44. The received signal was retransmitted to the ground, where its Doppler shift was examined to extract the range information. 45. Spectroscopic binaries can be found by observing doppler shifts in the spectrum of the star and its close companion. 46. Meteor radars can measure atmospheric density and winds by measuring the decay rate and Doppler shift of a meteor trail. 47. Phase coherent signals also allowed for the direct measurement of velocity via the Doppler shift of a single received signal. 48. He attempted to measure their velocity by the Doppler shift of spectral lines in the glow emitted by Crookes tubes. 49. It is easy to recognise a doppler shift in CF calls of flying bats due to their speed of flight. 50. An important feature of META was its use of frequency Doppler shift to distinguish between signals of terrestrial and extraterrestrial origin.
