Sound

Sound 

Sound of frequency less than 20 Hz is known as infrasound and greater than 20 kHz is known as ultrasound.

Ultrasound has many medical and industrial applications.

SONAR stands for Sound Navigation and Ranging and it works on the principle of reflection of sound waves.

The SONAR technique is used to determine the depth of the sea and to locate under water hills, valleys, submarines, icebergs sunken ships etc.

 

Top Formulae:

a.            Frequency and time period are related as follows

1

T

b.            Speed, v =  distance / time

 

3. The wave velocity (v), frequency of the wave (f) and its wavelength (λ) are related by the formula, v = f λ. 

First Part