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?

 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