Use the Fletcher-Munson curves of equal loudness to answer the following questio

Question

Use the Fletcher-Munson curves of equal loudness to answer the following questions. Remember that the horizontal axis is marked as a logarithmic scale. The divisions between the far left and 100 represent 20, 30, 40, 50, 60, 70 ,80 and 90. The divisions between 100 and 1000 represent 200, 300, 400, 500, 600, 700, 800, and 900.

1. What is the minimum threshold of hearing in intensity level (decibels) for a tone at 20 Hz? (Do not enter units)

2. What is the loudness of a 100 db tone at 20 Hz? (Enter the answer in phons. Do not enter units.)

3. What is the intensity level required for a 70 Hz tone to have a loudness of 70 phons?

Explanation / Answer

1) 60db

2) 75 phons

3) 80db

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