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.
Solution
Speed of sound in the tissue, v = 1.7 km/s = 1.7 × 103m/s
Operating frequency of the scanner, ν = 4.2 MHz
= 4.2 × 106 Hz
The wavelength of sound in the tissue is given as,
λ = v/v
= 1.7 × 103 / 4.2 × 106
= 4.1 × 10-4 m.
Operating frequency of the scanner, ν = 4.2 MHz
= 4.2 × 106 Hz
The wavelength of sound in the tissue is given as,
λ = v/v
= 1.7 × 103 / 4.2 × 106
= 4.1 × 10-4 m.
