Question

ME AJUDEM NA 79 PFV, URGENTEMENTE

Answer 1

$d = 10*log \frac{I}{I^{0}}\\ \\I = 100I^{0}\\ \\d = 10*log \frac{100I^{0}}{I^{0}}\\ d = 10*log100\\ d = 10*2\\ d = 20$