The radius of one woman\'s eardrum is 3.7mm. (a) Find the energy per second rece

Question

The radius of one woman's eardrum is 3.7mm. (a) Find the energy per second received by hereardrum when she listens to sound that is at the threshold ofhearing.
1 W
(b) Find the energy per second received by her eardrum when shelistens to sound that is at the threshold of pain.
2 W (a) Find the energy per second received by hereardrum when she listens to sound that is at the threshold ofhearing.
1 W
(b) Find the energy per second received by her eardrum when shelistens to sound that is at the threshold of pain.
2 W

Explanation / Answer

We know that :                   P = I A where A = r2  = ( 3.7 x 10-3)2                             = 3.14 * ( 3.7 x 10-3)2 = 4.29 x 10-5 m2 (a)          The energyper second received by her eardrum when she listens to sound thatis at the threshold of hearing is :                            P = (10-12 W/m2 )*  4.29 x 10-5 m2                                = 4.29 x 10-17 W (b)           Theenergy per second received by her eardrum when she listens to soundthat is at the threshold of pain is :                           P =  (1 W/m2 )*  4.29 x 10-5 m2                                = 4.29 x 10-5 W Hope this helps u!       (a)          The energyper second received by her eardrum when she listens to sound thatis at the threshold of hearing is :                            P = (10-12 W/m2 )*  4.29 x 10-5 m2                                = 4.29 x 10-17 W (b)           Theenergy per second received by her eardrum when she listens to soundthat is at the threshold of pain is :                           P =  (1 W/m2 )*  4.29 x 10-5 m2                                = 4.29 x 10-5 W Hope this helps u!                                = 4.29 x 10-5 W Hope this helps u!      

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