A 54-dB sound wave strikes an eardrum whose area is 5.0*10^-5m^2 . The intensity of the reference level required to determine the sound level is 1.0*10^-12W/m^2.1 year=3.156*10^7s .
Thank you for the opportunity to help you with your question!
3) a) energy/sec = power = E = I*A = 10^-12*5*10^-5 = 5*10^-7 W
b) time = E/P = 1/(5*10^-7) = 2e+6s frown emoticon 2*10^6 )/(3.156*10^7)= 63.3713561e?3 years
Content will be erased after question is completed.
Enter the email address associated with your account, and we will email you a link to reset your password.
Forgot your password?