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Using the sound level versus frequency plot with equal-loudness curves shown below, calculate the intensity in W/m2 for the 100-Hz sound having a loudness of 80 phons. (Use your estimate)

-120 phon.
120
-110 phon.
- 100 phon.
–90 phon
100
- 80 phon
- 70 phon
80
- 60 phon
-50 phon
60
40 phon
- 30 phon
40
- 20 phon
- 10 phon
20
O phon
-10
40
60
100
200
400
800
2000
5000
10,000
80
500
1000
4000
8000
Frequency (Hz)
Sound level (dB)
50

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