Question 42 Answer and Explanation _ACT April 2017 Form 74F Math Section

Question 42 Answer and Explanation _ACT April 2017 Form 74F Math Section

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42. The number of decibels, d , produced by an audio source can be modeled by the equation $d\,=\,10\,log(\frac{I}{K})$ , where $I$ is the sound intensity of the audio source and K is a constant. How many decibels are produced by an audio source whose sound intensity is 1,000 times the value of K ?

F. 4

G. 30

H. 40

J. 100

K. 10,000

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

From the title, d=10 log1000=30