A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is $4.2 MHz$. The speed of sound in a tissue is $1.7 \,km-s^{-1}$. The wavelength of sound in the tissue is close to
AIPMT 1995, Easy
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(a) $\lambda = \frac{v}{n} = \frac{{1.7 \times 1000}}{{4.2 \times {{10}^6}}} = 4 \times {10^{ - 4}}\,m$
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