ashleyd9243
14.02.2020 •
Physics
The intensity of the sound wave reaching your ear from a car radio 140 m away from you is 0.050 W/m2. The car drives toward you, so that the distance between you and the radio has decreased to one-fourth of its original value. Determine the new intensity of the sound reaching your ear.
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Ответ:
intensity (I2) = 0.8W/m²
Explanation: The relationship between the intensity of sound wave obeys the inverse square law, that's the intensity (I) is inversely proportional to square of distance (r).
I α r², I= kr²
I1 * (r1)² = I2 * (r2) ²
From the question,
I1 = 0.050W/m², r1 = 140m, I2 =?, r2= 1/4 * 140 = 35m.
By substituting the parameters, we have that
0.05 * (140)² = I2 * (35)²
0.05 * 19600 = I2 * 1225
980 = I2 * 1225
I2 = 980/1225
I2 = 0.8W/m²
Ответ:
i put 6,300 when i did it
Explanation:
so i think that's the answer the work is hard to explain