Question

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^-1? The operating frequency of the scanner is 4.2 MHz.

Answer 1

f = 4.2 × 10⁶ Hz

v = 1.7 × 10³ ms^-1

we know that, λ = v/f

\(= \frac{1.7 \times 10^3}{4.2 \times 10^6}\) 

= 4.05 × 10^-4 m

∴ wavelength of sound in tissue = 4.05 × 10^-4 m.