Question
Asked Oct 16, 2019
1a. A speaker is playing music at 4.3 W. What is the intensity of the music if the speaker
is 0.5 m away from you?
1b. What is the loudness of this speaker?
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1a. A speaker is playing music at 4.3 W. What is the intensity of the music if the speaker is 0.5 m away from you? 1b. What is the loudness of this speaker?

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Step 1

1(a)

Let the speaker is spherical in shape, then the equation for the intensity of the sound at a point is given by

P
I=-
472
Here, I is the intensity of the sound
P is the sound power and r is the distance from the speaker
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P I=- 472 Here, I is the intensity of the sound P is the sound power and r is the distance from the speaker

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Step 2

Substitute the numerical values in the above equation,

4.3W
4π(0.5)ή
1.37W/m
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4.3W 4π(0.5)ή 1.37W/m

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Step 3

1(b)

The equation for the loudness ...

L 10log
dB
Here, Lis the loudne ss and I is the reference sound intensity
The value of I is 1x10-12w/m2
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L 10log dB Here, Lis the loudne ss and I is the reference sound intensity The value of I is 1x10-12w/m2

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