A) \[4\times {{10}^{-4}}m\]
B) \[8\times {{10}^{-4}}m\]
C) \[4\times {{10}^{-3}}m\]
D) \[8\times {{10}^{-3}}m\]
Correct Answer: A
Solution :
[a] Frequency (n) \[=4.2\,MHz=4.2\times {{10}^{6}}Hz\] and speed of sound (v)\[=1.7\,km/s=1.7\times {{10}^{3}}m/s.\] Wave length of sound in tissue \[(\lambda )=\frac{v}{n}=\frac{1.7\times {{10}^{3}}}{4.2\times {{10}^{6}}}=4\times {{10}^{-4}}m.\]
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