Using the Fletcher-Munson curves of equal loudness, determine the loudness level

Question

Using the Fletcher-Munson curves of equal loudness, determine the loudness level in phons of each of the following tones. 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.

102030405060708090100110120 A 46dB tone at a frequency of 100Hz
102030405060708090100110120 A 60dB tone at a frequency of 1000Hz
102030405060708090100110120 A 60dB tone at a frequency of 50Hz
102030405060708090100110120 A 29dB tone at a frequency of 10kHz

Explanation / Answer

a. 30

b. 60

c. 30

d. 20

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