Frequency of tool‚Äö√Ñ√∂‚àö√ë‚àö¬•s oscillation in USM ranges between?$

Frequency of tool‚Äö√Ñ√∂‚àö√ë‚àö¬•s oscillati

1.	Frequency of tool‚Äö√Ñ√∂‚àö√ë‚àö¬•s oscillation in USM ranges between?$
A.	5-10 kHz
B.	10-15 kHz
C.	18-20 kHz
D.	25-50 kHz
Answer» D. 25-50 kHz