MCAT Physics Question 98: Answer and Explanation

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Question: 98

8. A certain sound level is increased by 20 dB. By what factor does its intensity increase?

A. 2
B. 20
C. 100
D. log 2

Correct Answer: C

Explanation:

Let I_i be the intensity before the increase and I_f be the intensity after the increase. Using the equation that relates sound level to intensity, obtain the ratio of I_i to I_f:

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