2. To reduce loudness of a drummer?s sound, insulation is added around a drummer

Question

2. To reduce loudness of a drummer?s sound, insulation is added around a drummer as she plays. The intensity level 5 m from the drummer -before insulation is added ? is 80 dB. The intensity level of the drummer with sound insulation at the same location 5 m from the drummer is 60 dB. By how many orders of magnitude did the sound insulation decrease the intensity I at this location? Assume the drummer does not change the way she plays before and after sound insulation is added. a. 2 b. 20 c. 1.25 d. 40 e. 0.8 Can you explain your choice?

Explanation / Answer

The relative sound Intensitylevel is

dB (beta) = 10 log [ If / Ii]

Given that Ii = 80 dB

If = 60 dB

Therefore

dB = 10 log [ 80 / 60]

= - 1.249 ( minus sign indicates that decrease in sound intensity )

Therefore correct option is C .

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