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sonido - Instituto Tecnolgico de Estudios Superiores de...

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Instituto Tecnol´ ogico de Estudios Superiores de Monterrey Sonido Fisica-II. Prof. Jos´ e Luis Garc´ ıa Luna January 6, 2009 INTENSIDAD DEL SONIDO 1. Una fuente sonora puntual de 20 W de potencia ac´ustica emite ondas esf´ ericas en un medio is´otropo y sin absorci´on. Determinar la intensidad de la onda a 10 m en dB . ( R: 102 dB ) 2. Un m´ aquina emite un ruido con una potencia de 1 W . Suponiendo que el sonido se propaga en forma de onda esf´ erica, determinar: a) La intensidad ac´ustica a 20 m en W/m 2 ; b) El nivel de intensidad en ese punto; c) ¿A qu´ e distancia el nivel de intensidad es de 60 dB ? ( R: 1 . 99 × 10 - 4 W/m 2 , b) 83 dB , c) 282 m ) 3. Un tono puro de 1000 Hz tiene un nivel de intensidad de 30 dB . Determinar cu´ antos tonos igual a ´ este deben sonar simult´ aneamente para producir un nivel que sea el doble del producido por un solo tono. ( R: 1000 ) INTERFERENCIA 4. Dos ondas se desplazan en la misma direcci´on en una cuerda e interfieren entre s´ ı.

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