Answer
82 dB
Work Step by Step
The intensity is only half as much as it was before.
Example 12–4 shows that halving the intensity reduces the sound level by 3 dB. The sound level for one firecracker is 85 dB – 3 dB = 82 dB.
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 12 - Sound - Problems - Page 354: 11
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