9 • Measurement of Sound Energy

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12 Terms

1
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Define Sound Intensity (I)

The energy crossing unit area per second at a point

2
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Define Threshold of Hearing

The lowest sound intensity that the human ear can detect

3
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Define the SI Unit for Threshold of Hearing

Wm-2

4
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Define the value of the Threshold of hearing

1x10 -12 Wm-2

5
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Define The Bel (B)

The relative increase in sound intensity

6
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<p>Label This Formula</p><p>Number of bels</p>

Label This Formula

Number of bels

I1 - intensity 1

I2 - intensity 2

7
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Define Sound Intensity Level / Decibel Scale

The sound intensity of a source or sound expressed relative to the thresgiold of hearing

8
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<p><span style="color: rgb(0, 0, 0);"><span>Label this Formula</span></span></p><p><span style="color: rgb(0, 0, 0);"><em><span>Intensity Level</span></em></span></p>

Label this Formula

Intensity Level

I - Intensity

9
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Define the SI Unit for the Sound Intensity Level

dB

10
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What happens when the sound intensity doubles?

The sound level increases by 3dB

11
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Define dB(A) scale

A sound level scale which is adapted to match the ears frequency response

12
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<p><span style="color: rgb(0, 0, 0);"><span>Label This Diagram</span></span></p><p><span style="color: rgb(0, 0, 0);"><em><span>The Sound Level Meter</span></em></span></p>

Label This Diagram

The Sound Level Meter

a - microphone

b - dba scale reading

c - adjustments