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.11th physics , chapter-15

Answer 1

Speed of the wave ( V) = 1.7 km/s
= 1700 m/s
Operating frequency of the scanner ( f) = 4.2 MHz
= 4.2 × 10^6 Hz

We know,
Wavelength = speed of wave/frequency
So, wavelength of sound in the tissue = 1700/4.2 × 10^6
= 4.1 × 10^-4 m

Answer 2

Answer:

Explanation:

Speed of the wave ( V) = 1.7 km/s

= 1700 m/s

Operating frequency of the scanner ( f) = 4.2 MHz

= 4.2 × 10^6 Hz

We know,

Wavelength = speed of wave/frequency

So, wavelength of sound in the tissue = 1700/4.2 × 10^6

= 4.1 × 10^-4 m