What sound levels must sounds of the following frequencies have in order to have

Question

What sound levels must sounds of the following frequencies have in order to have the same loudness as a 40 dB sound of frequency 1000 Hz (that is, to have a loudness of 40 phons)? Refer to Figure 16.22.
60 Hz
? dB
400 Hz
? dB
6000 Hz
? dB

If a woman needs an amplification of 7.0 ? 104 times the threshold intensity to enable her to hear at all frequencies, what is her overall hearing loss in dB? Note that smaller amplification is appropriate for more intense sounds to avoid further damage to her hearing from levels above 90 dB.
? dB

Explanation / Answer

1) For 200Hz frequency with 40 photon sound level is 52dB

2) for 1000Hz frequency with 40 photon sound level is 40dB

3) for 6000Hz frequency with 40 photon sound level is 58dB.

For the second part. I'm not entirely sure. Was that all the question had?

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