2 years ago

Is an acoustic wave mechanical or electromagnetic?

Physics

2 answers:

Serggg [28]2 years ago

7 0

I believe it is a mechanical wave.

netineya [11]2 years ago

5 0

Mechanical wave for sure

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Answer:

Part a)

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Part b)

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Explanation:

Part a)

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now we know that

$L = 10 Log\frac{I}{I_0}$

here we know that

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now we have

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Part b)

Intensity of sound wave is given as

$I = \frac{1}{2}\rho A^2\omega^2 c$

here we know that

$A = \frac{P_o}{Bk}$

so we have

$I = \frac{1}{2}\rho(\frac{P_o}{Bk})^2\omega^2 c$

$I = \frac{1}{2}\rho P_o^2 \frac{c^3}{B^2}$

now we know

$\rho = 1.2 kg/m^3$

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$B = 1.4 \times 10^5 Pa$

now we have

$3.16 \times 10^{-5} = \frac{1}{2}(1.2)P_o^2\frac{340^3}{(1.4\times 10^5)^2}$

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