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 :
Given: Frequency (n)\[=4.2\text{ }MHz=4.2\times {{10}^{6}}\,Hz\] and speed of sound \[(c)\,=1.7\,km/s\,=1.7\,\times {{10}^{3}}6\,m/s\]. We know that wave length of sound in tissue \[\lambda =\frac{c}{n}=\frac{1.7\times {{10}^{3}}}{4.2\times {{10}^{6}}}=4\times {{10}^{-4}}m.\]
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