Aperson wears a hearing aid that uniformly increases the sound level of all audible frequencies of sound by 28.1 db. the hearing aid picks up sound having a frequency of 250 hz at an intensity of 3.30 10-11 w/m2. what is the intensity delivered to the eardrum?
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Ответ:
I₂ = 2.13 x 10⁻⁸ W/m²
Explanation:
given,
increase in sound level = 28.1 dB
frequency of the sound = 250 Hz
intensity = 3.3 x 10⁻¹¹ W/m²
Intensity delivered = ?
the difference of intensity level is give as
I₂ = 645.65 I₁
I₂ = 645.65 x 3.3 x 10⁻¹¹
I₂ = 2.13 x 10⁻⁸ W/m²
Ответ:
And we know that the leg that is labeled with a line is also 6.
Use the Pythagorean theorem and solve for x.
a² + b² = x²
3² + 6² = x²
9 + 36 = x²
45 = x²
√45 = x
√9×5 = x
√9√5 = x
3√5 = x
The answer is 3√5
Hope this helps :)