Question

what is wavelength of ultra sonic waves ＼(｀0´)／

Answer 1

Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less.

Answer 2

$\fbox\red{ What is Wavelength? }$

• Wavelength is the measure of distance so the units for wavelength are always distance units such as metres ,centimetres, millimetres etc.

• It it is represented by the Greek letter lambda (λ)

and expressed in the SI unit meters (m).

$\fbox{ Wavelength of ultra sonic waves}$

In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less.

The frequencies used in ultrasonic diagnosis are in the range of 1 to 10 MHz. The speed of sound waves in the tissues of the human body averages about 1540 m/s (close to that for water). So, the wavelength of a 1 MHz wave is about λ = v/f = 1540/1∙106 = 1.5∙10–3 m = 1.5 mm.