Ultrasonic waves of frequency 4.5 MHz are used to detect tumour in soft tissues. The speed of sound in tissue is `1.5 km s^-1` and that in air is `340 m s^-1`. Find the wavelength of this ultrasonic wave in air and in tissue.

Answer

A, C, D

Explanation

a. Given V_(air)=340 m/s`
`n=4.5xx10^6Hz`
`rarr lamda_(air)=340/(4.5xx10^-5)m`
b. V_(Tissue)=15000 m/s`
`rarr lamda=15000/(4.5xx10^-6)m`
`=3.3x10^-4m`