Question

What is the sound intensity level in decibels of ultrasound of intensity 7.53 ✕ 104 W/m2, used to pulverize tissue during surgery?

Answer 1

Answer : The intensity of sound level in decibels is, 169 dB

Explanation:

The expression used for the intensity of sound level is given by the equation:

$P=10\times \log \frac{I}{I_o}$

where,

I = final intensity = $7.53\times 10^4W/m^2$

$I_o$ = initial intensity = threshold intensity of human hearing = $10^{-12}W/m^2$

Now put all the given values in the above formula, we get:

$P=10\times \log \frac{7.53\times 10^4W/m^2}{10^{-12}W/m^2}$

$P=168.767dB\approx 169dB$

Thus, the intensity of sound level in decibels is, 169 dB