3 years ago

A millimeter is _______ meter(s). A. 1,000 B. 100 C. 1/100th D. 1/1,000th

Physics

1 answer:

Zielflug [23.3K]3 years ago

7 0

1 millimetre is 0.001 metre.
1 metre is 1,000 millimetres.

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A person standing a certain distance from four identical loudspeakers is hearing a sound level intensity of 125 dB. What sound l

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Answer:

$\mathbf{\beta = 123.75 \ dB}$

Explanation:

From the question, using the expression:

$125 \ dB = 10 \ log (\dfrac{I}{I_o})$

where;

$I_o = 10^{-12} \ W/m^2$

$I = 10^{12.5} \times 10^{-12} \ W/m^2$

$I = 3.162 \ W/m^2$

This is a combined intensity of 4 speakers.

Thus, the intensity of 3 speakers = $\dfrac{3.162\times 3}{4}$

= 2.372 W/m²

Thus;

$\beta = 10 \ log ( \dfrac{2.372}{10^{-12}} ) \ W/m^2$

$\mathbf{\beta = 123.75 \ dB}$

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Reference what are physical properties

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