giúp em bài sóng âm khó này với

N

newstarinsky

Ta có [TEX]\ L_1-L_2 [/TEX]=2

[TEX]\Leftrightarrow 10.lg(\frac{I_1}{I_2})=2[/TEX]

[TEX]\Leftrightarrow \frac{I_1}{I_2}=1,59[/TEX]

[TEX]\Leftrightarrow \frac{A_1^2}{A_2^2} = 1,59[/TEX] (vì [TEX]I=\frac{P}{S}=\frac{1}{2}.m.\ A^2.\omega^2[/TEX])

[TEX]\Leftrightarrow \frac{A_1}{A_2}=1,259[/TEX]
 
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