Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Physics Wave

The ultrasound equipments used for investigating medical problems work at frequency

1

below 20 Hz

2

between 200 Hz and 20000 Hz

3

above 20000 Hz

4

More than one of the above

5

None of the above

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