A hospital uses an ultrasonic scanner to locate tumour in a tissue. What is the wavelength of sound in a tissue in which the speed of sound is `1.7 km//s` ? The operating frequency of the scanner is `4.2 MHz`.

Explanation

Speed of sound in the tissue, v = 1.7 km/s `= 1.7 xx 10^(3)` m/s
Operating frequency of the scanner, ν = 4.2 MHz `= 4.2 xx 10^(6)` Hz
The wavelength of sound in the tissue is given as:
`lambda=(v)/(v)`
`=(1.7xx10^(3))/(4.2xx10^(6))=4.1xx 10^(-4) m`