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Soit une source ultrasonore ponctuelle de fréquence 3 MHz en contact avec du tissu musculaire, et sachant que le coefficient d'atténuation du tissu musculaire vaut 0,15 cm-1 pour une fréquence de 1 MHz, quelle est l'intensité à 3 cm de la source si elle est de 0,01 W.cm-2 à la profondeur de 5 cm ?
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