Using the Fletcher-Munson curves of equal loudness, rank the following tones by

Question

Using the Fletcher-Munson curves of equal loudness, rank the following tones by decreasing loudness (1=loudest). Remember that the horizontal axis is marked as a logarithmic scale. The divisions between 100 and the far left represent 90, 80, 70, 60, 50, 40, 30, and 20. The divisions between 100 and 1000 represent 200, 300, 400, 500, 600, 700, 800, and 900.

1 2 3 4  A 70dB tone at a frequency of 10,000Hz
1 2 3 4  A 70dB tone at a frequency of 4,000Hz
1 2 3 4  A 70dB tone at a frequency of 40Hz
1 2 3 4  A 70dB tone at a frequency of 1000Hz

Explanation / Answer

2, 4, 1, 3

its clear from the graph.

1 is a point on the 4th curve from the up.

2 is a point on the 9th curve from the up.

3 is a point between the 6th and 7th curve from the up.

4 is a point on the 6th curve from the up.

so if we arrange them by decreasing loudness, that arrangment will be

2 4 1 3  

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