Question

<module 1b
± threshold of human hearing conceptual question
the human ear is not equally sensitive to all frequencies of sound. in other words, a particular noise may sound louder or softer depending on the frequency of the sound wave being transmitted. because of this variation, scientists have defined a unit of loudness, called a phon, to represent the intensity of sound waves with a frequency of 1000 hz. a 60 - phon sound is one that is perceived by the human ear to have the same loudness as a sound wave with an intensity of 60 db and a frequency of 1000 hz
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part b
for a sound at 100 hz, what is the decibel level necessary for human perception?
enter your answer numerically in decibels to two significant figures.
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part c
how many times more intense is the least intense perceptible sound at 100 hz compared to the least intense perceptible sound at 1000 hz? specifically, you are looking for the ratio i100 hz/i1000 hz

Explanation:

Step1: Locate frequency on graph

Locate 100 Hz on x - axis of the graph.

Step2: Find threshold intensity

Find the intensity (in dB) on the y - axis corresponding to the 0 - phon curve at 100 Hz. From the graph, the decibel level for human perception (0 - phon curve represents the threshold of human hearing) at 100 Hz is approximately 40 dB.

Answer:

40