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anastassius [24]
3 years ago
8

Which type of musical instrument produces music by amplifying the vibration of attached cords? a. woodwinds c. stringed b. brass

d. percussion  
Physics
2 answers:
grandymaker [24]3 years ago
5 0
C. stringed hope this helps 
natta225 [31]3 years ago
3 0
C. Stringed
I hope this helps
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Answer:

3 times louder

Explanation:

The Loudness in decibel Db  L = 10㏒(I/I₀)  where I = sound intensity level and I₀ = threshold of hearing = 10⁻¹² W/m².

Now, for Jessica, I₁ = sound intensity level of Jessica's music = 10⁻⁹

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So, substituting the variables into the equation, we have

L₁ = 10㏒(I₁/I₀)

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So, substituting the variables into the equation, we have

L₂ = 10㏒(I₁/I₀)

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L₂ = 10㏒(10⁹)

L₂ = 9 × 10㏒10

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