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$A$ hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is $1.7 \; km/s$? The operating frequency of the scanner is $4.2 \; MHz$.
- A$1.6 \times 10^{-3} \; m$
- B$4.1 \times 10^{-4} \; m$
- C$8.2 \times 10^{-3} \; m$
- D$6.3 \times 10^{-5} \; m$
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