A sound level meter placed in front of the loudspeaker of a 60W and audio system reads 70dB. All else being equal, when placed in front of 120 W system, the meter will read ('x' in dB). Writ

Question

A sound level meter placed in front of the loudspeaker of a 60W and audio system reads 70dB. All else being equal, when placed in front of 120 W system, the meter will read ('x' in dB). Write $\frac{x + 7}{10}$ as your answer. ( $x$ is in nearest integer and $lo g_{10} 2 = 0.30$ ).

Answer:

8

Solution:

$x - 70 = 10 lo g \frac{120}{60} = 10 lo g 2 = 3$ , so x = 73

$\frac{x + 7}{10} = \frac{80}{10} = 8$

Answer 8

TestHub · Accepted Answer

x − 70 = 10 lo g 60 120 ​ = 10 lo g 2 = 3 , so x = 73 10 x + 7 ​ = 10 80 ​ = 8 Answer 8

Physics - Sound Wave Question with Solution | TestHub

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