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Q.

 Old man can’t  hear sounds even above _________________________. 

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a

5,000 Hz

b

15,000 Hz

c

10,000 Hz

d

8,000 Hz

answer is B.

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Detailed Solution

 Adults are unable to hear high-pitched sounds because our ability to hear high-pitched frequencies declines beyond the age of 25. 

High-pitched sounds above 15 kHz are usually only heard by children. 

Presbycusis is the medical name for the deterioration of our hearing.

Hence, Old man can’t  hear sounds even above 15,000 Hz

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