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Grade: upto college level
        The noise level in a classroom in absence of the teacher is 50 dB when 50 student s are present. Assuming that on the average each student outputs same sound energy per second, what will be the noise level if the number of students is increased to 100?
5 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
471 Points
							Sol. Let the intensity of each student be I.
According to the question
β base A = 10log base 10 50 l/l base 0 ; β base B = 10 log (100 l/l base 0)
= 10 l log(100 l/50 l) = 10 log base 10 2 = 3
So, β base A = 50 + 3 = 53 dB.

						
5 years ago
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