Answer:
56.4 dB
Explanation:
Threshold of hearing, Ir = 1 * 10^-12
Intensity of sound, I = 4.33 * 10^-7
The sound level, L is calculated thus :
L = 10log(I / Ir)
L = 10log(4.33 * 10^-7 / 10^-12)
L = 10log(4.33 * 10^(-7+12))
L = 10log(4.33 * 10^5)
L = 10 * 5.6364878
L = 56.364878
L = 56.4 dB
