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A hearing test is conducted on an aged p...

A hearing test is conducted on an aged person. It is found that her threshold of hearing is 20 decibels at 1 kHz and it rises linearly with frequency to 60 decibels at 9 kHz. The minimum intensity of sound that the person can hear at 5 kHz is-

A

10 times than that at 1 kHz

B

100 times than that at 1 kHz

C

`0.5` times than that at 9 kHz

D

`0.05` times than that at 9 kHz

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The correct Answer is:
B
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