Rats can perceive sound waves of frequency from ........... KHz.

20 - 30

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150

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1000

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20 - 90

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Solution

The correct option is C 20 - 90
The hearing is a mechanism which requires a sound under a particular range of frequency. It is known as the audible range. Ultrasonic sound is the sound of higher frequency and infrasonic are the sound of lower frequency as compared to normal audible range. Rats hearing frequency can be as low as 20 kHz to as high as 90kHz.
So, the correct answer is option D.

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