$A$ hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in a tissue in which the speed of sound is $1.7 \, km \, s^{-1}$? The operating frequency of the scanner is $4.2 \, MHz$ $(1 \, MHz = 10^{6} \, Hz)$.
- A$4 \times 10^{-4} \, m$
- B$4.2 \times 10^{-4} \, m$
- C$1.7 \times 10^{-4} \, m$
- D$2.5 \times 10^{-4} \, m$
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