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Few questions

Dear Chirs,
Can you please answer to my questions

Why peizo electric quartz cystal is the preffered in ultrasound ? why not other ceramic material ?

Power ultrasound ( low frequency and high power ) can be made to operate 24-7 ? How do you remove heat ? Heat sink when you talk about large ultrasound ?

What is the typical efficiceny when the power from electricity is transeffered to the desired accoustic effect. ( energy losses in temperature ) ? Does the power loss go up exponentially with the power of ultrasound going up ?

Can you change the power and the frequency of ultrasound ?

Delivery device of maintenance issues ?

Miscellenous maintenance issues ?