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Консультация № 178429
16.05.2010, 16:01
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И это опять я, уважаемые эксперты, последняя задача для вас и наконец-то я отстану:
На расстоянии 100 м от точечного изотропного источника звука частоты 200 Гц уровень громкости 50 дБ. Порог слышимости на этой частоте соответствует интенсивности звука 0,10 нВт/м^2. Коэффициент затухания звуковой волны 5,0*10^(-4) м^(-1). Найти звуковую мощность источника.
Надеюсь не слишком надоел,благодарю всех,кто это читал и решал.
На расстоянии 100 м от точечного изотропного источника звука частоты 200 Гц уровень громкости 50 дБ. Порог слышимости на этой частоте соответствует интенсивности звука 0,10 нВт/м^2. Коэффициент затухания звуковой волны 5,0*10^(-4) м^(-1). Найти звуковую мощность источника.
Надеюсь не слишком надоел,благодарю всех,кто это читал и решал.
Обсуждение
17.05.2010, 08:56
общий
это ответ
Здравствуйте, Aptemis.
Уровень интенсивности звука:
L=10lg(I0/I), где I0 — условная интенсивность, соответствующая нулевому уровню интенсивности.
Выразим интенсивность:
I=I0*10L
С учетом затухания будем иметь:
I=e2yr*I0*10L
Связь мощности N точечного изотропного источника звука с интенсивностью звука:
I=N/(4пr2)
Приравниваем:
e2yr*I0*10L=N/(4пr2)
N=4пr2*e2yr*I0*10L
Вычислим искомую величину:
N=4*3.14*10000*e2*100*0.0005*10-10*105=1.256(Вт)
Уровень интенсивности звука:
L=10lg(I0/I), где I0 — условная интенсивность, соответствующая нулевому уровню интенсивности.
Выразим интенсивность:
I=I0*10L
С учетом затухания будем иметь:
I=e2yr*I0*10L
Связь мощности N точечного изотропного источника звука с интенсивностью звука:
I=N/(4пr2)
Приравниваем:
e2yr*I0*10L=N/(4пr2)
N=4пr2*e2yr*I0*10L
Вычислим искомую величину:
N=4*3.14*10000*e2*100*0.0005*10-10*105=1.256(Вт)
Форма ответа
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