Frequency of Ultrasonic wave is :-

Less than 20000 Hz

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greater than 20000 Hz

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less than 20 Hz

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1000 Hz

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Solution

The correct option is B
greater than 20000 Hz

Ultrasonic wave:-: A longitudinal wave whose frequency is above the upper limit of audible range i.e. 20 kHz, is called an ultrasonic wave.
Hence option (b) is the correct option.

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Determine the wavelength of the ultrasonic wave of frequency 4.2 MHz.The speed of ultrasonic wave is 1.4km/s

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