Question

assessing risk management techniques
after school, angelique attends a concert with her
friends. the concert lasts two hours, and the volume is
120 decibels. to safely watch the concert,
approximately how many decibels must her earplugs
block?
15
20
25
30

Explanation:

Step1: Find the safe noise level for 2 - hour exposure

From the table, the noise level with a maximum exposure time of 2 hours is 91 decibels.

Step2: Calculate the decibels to be blocked

The concert volume is 120 decibels. The decibels to be blocked is \(120 - 91=29\approx30\)

Answer:

30