MCQOPTIONS
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| 1. |
Mechanical pulse having an oscillation frequency in range of `_____________ |
| A. | 30 kHz to 40 kHz |
| B. | 40 kHz to 50 kHz |
| C. | 50 kHz to 60 kHz |
| D. | 60 kHz to 70 kHz |
| Answer» C. 50 kHz to 60 kHz | |