2) An operator works on the lathe for the first 2 hours in an 8-hour shift. He works on the milling machine for the next 3 hours. Then he performs the operations on the drill bench for 2 hours. In the last hour, he works on the press bench. The sound pressure level created by the lathe was measured as 85 dB, the sound pressure level of the milling machine as 90 dB and the press bench as 95 dB. Accordingly, answer the questions below. (30 POINTS)

a) Calculate the equivalent noise level in the environment. (10 POINTS)

b) Determine how many dB the total sound pressure level in the environment when all benches are operating at the same time. (10 POINTS)

c) Determine and interpret the dose level to which the operator is exposed. (10 POINT)

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