Range of frequency of ultrasound is:

2 kHz - 106 Hz

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25 kHz - 1015 Hz

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2 kHz - 1010 Hz

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20 kHz - 107 Hz

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Solution

The correct option is D 20 kHz - 107 Hz
The frequency of ultrasonic wave is greater than 20,000 Hz and equal to 107 Hz. These waves are not audible to a human ear but they can be heard by animals and birds.

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