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The sound generator is turned on and the piston is adjusted until the sound from the tube suddenly gets much louder. This indicates that the tube is at resonance. This means the length of the round-trip path of the sound waves, from one end of the tube to the other and back again, is a multiple of the wavelength λ of the sound waves. Therefore ...
Arguably, these circa 1887 experiments by Berliner were the first known reproductions of sound from phonautograph recordings. [16] However, as far as is known, no attempt was ever made to use this method to play any of the surviving early phonautograms made by Scott de Martinville.
In 1927, the sound film The Jazz Singer was released; while not the first sound film, it made a tremendous hit and made the public and the film industry realize that sound film was more than a mere novelty. The Jazz Singer used a process called Vitaphone that involved synchronizing the projected film to sound recorded on a disc. It essentially ...
Upon removing the flame, he obtained a loud sound from the tube which lasted until the gauze cooled down (about 10s). It is safer in modern reproductions of this experiment to use a borosilicate glass tube or, better still, one made of metal. Instead of heating the gauze with a flame, Rijke also tried electrical heating.
Sound (or lattice vibration) can be described by a phonon just as light can be considered as photons, and therefore one can state that SASER is the acoustic analogue of the laser. [citation needed] In a SASER device, a source (e.g., an electric field as a pump) produces sound waves (lattice vibrations, phonons) that travel through an active medium.
The speed of sound depends on the medium the waves pass through, and is a fundamental property of the material. The first significant effort towards measurement of the speed of sound was made by Isaac Newton. He believed the speed of sound in a particular substance was equal to the square root of the pressure acting on it divided by its density:
The Dickson Experimental Sound Film is a film made by William Dickson in late 1894 or early 1895. It is the first known film with live-recorded sound and appears to be the first motion picture made for the Kinetophone , the proto- sound-film system developed by Dickson and Thomas Edison .
An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing ...