Question

sensitivity of the human ear as a function of frequency is shown in figure 1
part a
what is the lowest frequency that an ear can detect when the sound level is 60 db?
about 80 - 90 hz
about 200 hz
about 700 hz
about 30 - 40 hz
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part b
what is the highest frequency that an ear can detect when the sound level is 60 db?
about 10,000 hz

Explanation:

Step1: Locate 60 - dB line

Find the 60 - dB sound - level line on the graph.

Step2: Find lowest frequency

Look at the left - most point where the 60 - dB line intersects the sensitivity curve. Estimate the corresponding frequency value. From the graph, it is about 30 - 40 Hz.

Step3: For Part B

Locate the 60 - dB line again. Look at the right - most point where the 60 - dB line intersects the sensitivity curve. Estimate the corresponding frequency value. From the graph, it is about 10,000 Hz.

Answer:

Part A: about 30 - 40 Hz
Part B: about 10,000 Hz