Two loud speakers, s1 (0, 0) and s2 (d, 0), have an initial phase difference of . Both speakers are driven by a source of frequency 500 hz and intensity separately. Assume the intensity of each speaker (i o) does not decay due to the distance. (a) for what values of d will the listener (2d, 0) hear no sound, and the sound of greatest intensity if =/4? (b) if d=6.0 m, what is the sound intensity this listener would receiv
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loudspeaker (or loud-speaker or speaker) is an electroacoustic transducer;[1] a device which converts an electrical audio signal into a corresponding sound.[2] The most widely used type of speaker in the 2010s is the dynamic speaker, invented in 1924 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal. When an alternating current electrical audio signal is applied to its voice coil, a coil of wire suspended in a circular gap between the poles of a permanent magnet, the coil is forced to move rapidly back and forth due to Faraday's law of induction, which causes a diaphragm (usually conically shaped) attached to the coil to move back and forth, pushing on the air to create sound waves. Besides this most common method, there are several alternative technologies that can be used to convert an electrical signal into sound. The sound source (e.g., a sound recording or a microphone) must be amplified or strengthened with an audio power amplifier before the signal is sent to the speaker.