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Answer :
Final answer:
The REUR measurement is not a measurement of open ear canal resonance; it is the sound pressure level in the ear canal without a hearing aid. The fundamental resonant frequencies of the ear canal relate to its size and shape, affecting the sound reception but ear is not particularly sensitive to the calculated overtones, the given statement is false.
Explanation:
The statement that REUR is a measurement of open ear canal resonance is false. REUR stands for Real-Ear Unaided Response, which is a measurement of the sound pressure level in the ear canal without a hearing aid in place, but it does not specifically measure the ear canal's resonance. The open ear canal indeed resonates, acting much like a tube that is closed at one end. The range of fundamental resonant frequencies for ear canals, which can vary in length between 1.80 to 2.60 cm, can be calculated based on the tube resonance formula for a closed tube.
The air temperature, which can affect the speed of sound, is considered to be 37.0°C – the typical human body temperature. Given the nonuniform shape of the ear canal, these calculations are approximations, yet important for understanding human ear sensitivity as it correlates with intensity versus frequency graphs. For example, an ear canal length of 2.40 cm would result in the first overtone frequency being around 11.0 kHz, a frequency that the human ear is not particularly sensitive to, thereby such overtones are generally not heard.
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