参考答案:C
解:根据公式N=A/π×λ可知λ = A/π×N 得
Λ= A/π×N = 8×10/3.14×10.8
= 2.36mm
则频率为: ƒ = c/λ = 5.9×106/2.36
= 2.5 MHZ
答:该探头的频率为2.5 MHZ
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