TAILIEUCHUNG - Science of Everyday Things Vol. 2 - Physics Episode 11

Tham khảo tài liệu 'science of everyday things vol. 2 - physics episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Doppler Effect the moving source are stretched out resulting in a lower frequency. After developing a mathematical formula to describe this effect Doppler presented his findings in 1842. Three years later he and Dutch meteorologist Christopher Heinrich Buys-Ballot 1817-1890 conducted a highly unusual experiment to demonstrate the theory. Buys-Ballot arranged for a band of trumpet players to perform on an open railroad flatcar while riding past a platform on which a group of musicians with perfect pitch that is a finely tuned sense of hearing sat listening. The experiment went on for two days the flatcar passing by again and again while the horns blasted and the musicians on the platform recorded their observations. Though Doppler and Buys-Ballot must have seemed like crazy men to those who were not involved in the experiment the result as interpreted from the musicians written impressions of the pitches they heard confirmed Doppler s theory. REAL-LIFE A P P L I C AT IONS Sound Compression and the Doppler Effect As stated in the introduction one can observe the Doppler effect in a number of settings. If a person is standing by the side of a road and a car approaches at a significant rate of speed the frequency of the sound waves grows until the car passes the observer then the frequency suddenly drops. But Doppler of course never heard the sound of an automobile or the siren of a motorized ambulance or fire truck. In his day the horse-drawn carriage still constituted the principal means of transportation for short distances and such vehicles did not attain the speeds necessary for the Doppler effect to become noticeable. Only one mode of transportation in the mid-nineteenth century made it possible to observe and record the effect a steam-powered locomotive. Therefore let us consider the Doppler effect as Doppler himself did in terms of a train passing through a s tation. THE SOUND OF A TRAIN WHISTLE. When a train is sitting in a station prior to leaving it blows .

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