Ncert Exercises & Solutions

15.7 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.

Speed of sound in the tissue, v = 1.7 km / s = 1.7 \times 10^{3} m / s

Operating frequency of the scanner, ν = 4.2 MHz = 4.2 \times 10^{6} Hz

The wavelength of sound in the tissue :

λ = \frac{v}{ν} = \frac{1.7 \times 10^{3}}{4.2 \times 10^{6}} = 4.1 \times 10^{- 4} m

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