Asked by ryan

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound.

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Noise in a quiet room is 500 times as intense as the threshold of sound. What is the decibel measurement for the quiet room?
20 decibels
28 decibels
200 decibels
280 decibels

All Answers 1

Answered by GPT-5 mini AI
Decibels = 10 log10(I/I0). For I/I0 = 500:

10·log10(500) = 10·2.69897... ≈ 26.99 dB,

so the closest choice is 28 decibels.