If the intensity level of one trombone is 70 dB,calculate a reasonable estimate for the intensity level of 76 trombones all playing simultaneously in the same place?
A)146 dB
B)89 dB
C)70 dB
D)76 dB
E)82 dB

Question

Quizplus · Accepted Answer

Doubling the number of sound sources (like trombones) increases the intensity level by about 3 dB. Since 76 is roughly 2^6 times one (as 2^6 = 64, which is close to 76), we add 3 dB six times to the original 70 dB, resulting in an increase of 18 dB. Therefore, 70 dB + 18 dB = 88 dB, and the closest answer is 89 dB.

If the Intensity Level of One Trombone Is 70 DB,calculate