A grade-school teacher insists that the the overall sound level in his classroom not exceed 64 dB at his location. There are 25 students in his class. If each student talks at the same intensity level, and they all talk at once, what is the highest sound level at which each one can talk without exceeding the limit? in DB?

SL = 64db / 25 = 2.56db.

To determine the highest sound level at which each student can talk without exceeding the limit, we need to divide the overall sound level of 64 dB by the number of students in the class (25).

To do this, follow these steps:

1. Divide the overall sound level by the number of students:
64 dB / 25 students = 2.56 dB

2. Since we cannot have fractional decibels, we need to round down to the nearest whole number. Therefore, the highest sound level at which each student can talk without exceeding the limit is 2 dB.

So, each student can talk at a maximum of 2 dB without exceeding the limit.