Question $1$

A worker is exposed to $95dB(A)$ for $30$min,$90dB(A)$ for $3$ h $,$ and $85dB(A)$ for $4$ h $30$ min $.$ Calculate his noise dose for this $8$ h period. Do calculations using both the U$.$S$.$ and EU standards.

$D=100(\frac{C_1}{T_1}+\frac{C_2}{T_2}+$dots$+\frac{C_n}{T_n})\%$

$T=\frac{8}{2^{\frac{L-90}{5}}}$

$T=\frac{8}{2^{\frac{L-85}{3}}}$

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