Question
What is the frequency of the instrument used commonly in ENT clinics,as shown in the image?
A. 512 Hz.
B. 1048 Hz.
C. 248 Hz.
D. All of the above.
Show Answer
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Correct Answer » A
Explanation
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Ans: A. 512 Hz.
The instrument shown in the picture above represents tuning fork.
The tuning fork tests provide a reliable clinical method for assessing hearing loss
Ideally 3 frequencies are used 256 Hz, 512 Hz, and 1024 Hz. These three frequencies are used because they fall within speech frequency range.
The most preferred and commonly used is 512 Hz since tuning forks of higher frequency have shorter decay time and those with lower frequency produce a sense of bone vibration. It is a frequency common in human speech.
