What is the frequency range of the sound used for ultrasound diathermy?

What is the frequency range of the sound used for ultrasound diathermy? Correct Answer 0.7 – 3.3 MHz

The ultrasound treatment can penetrate up to 2 – 5 cm deep within the skin to relieve pain. The frequency of 0.7 – 3.3 MHz is used. If the frequency is increased, it can cause excess heat causing heat burns in the body and doing damage rather than therapy.
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