Question

A hospital uses an ultrasonic scanner of frequency 3.2 MHz to locate the tumours in a tissue. The wavelength of ultrasonic waves in tissue in which the speed of the wave is 1.6 km/s is
A. `25 xx 10^(-5)m`
B. `5 xx 10^(-4)m`
C. `75 xx 10^(-5)m`
D. `2 xx 10^(3) m`

Answer 1

Correct Answer - B
`v = n lamda`
`:. lamda = (v)/(n) = (1.6 xx 10^(3))/(3.2 xx 10^(6) = 5 xx 10^(-4) m`